PLS read it first - it is complex solution that can really help. Sorry if i am to rude - but i try to tell like it really is - so sorry.
It is a lot of builds in current game. And when you make some change to even TOP DPS builds - you harm a lot of different players who do not have so much DPS. As example you make change in build for 140k dps - it now do 130k, but the same time builds who do 97k DPS now becomes do 50k.
People becomes angry on you - because you destroy game for them and take there favorite builds away.
First of ALL - i do not think about current "elit exp players = META" as about some thing special. I think that some self proclamed "guru" - just make for a lot of years comfortable balance for themselves, by nerfing other players favorite skills, builds and game stiles.
What i really want - game be really balanced and players be happy - not all META and self proclaimed elitists - but all good playing and casual players.
The same time i do not want it take to much work for you too - so it will be easy to make ! It will not take years and it will be easy to control.
So if you stop for some time with current PTS changes (better delete them

) - and if we take current LIVE situation - on servers - BALANCE IS NOT REALLY AS BAD !!!
It needs little fixes - that is ALL. If current PTS go live - it will have so much code mistakes that next year you will need to fix it - and balance in patch is only worse, so we wil not get better balance for about 1-2 years.
Lets decide a tasks what we really want to do - and focus on it.
1) We want good players have near the same DPS. The casual who just stand near boss - can not have the same DPS as really skillfull player. Because game becomes not interested to play.
But for good Players - it will be nice if damage will be + / - the same.
I played a lot of games and i can not say - that "wiwing" - is some thing really skillfull and some thing you need to be proud. It is such a small game expirience - that it is nothing to be proud.
But - is it harder than do no "wiwing" at all ? Yes it is !!! Thats why it must be revarded ! But not that much as it is now !
But you can not just nerf LA - because some builds who as example use only LA - lose 50+ % of damage. And if say trully - they do near the same as "wiwing" players do - they spam button - not skill+la, but LA+LA. So you punish them more ! They are the same players as all others ! But not META guys get hit - but they do !!! Meta do not really lose that much - you only empower it ! And nerf all other players !
To solve this problem lets look on game mechanics:
What is LA - it is free damage source. You can put it betwin skills - and it really is not bad. But some times game work really bad - it do not normally work - and game start to fell bad.
The same time a lot of players can perfectly do it - but for a long time you do it - if as example you work with PC 24*7 - your hand starts hurt. Such players can continue it with no problems - but game gives him no fun. He is concentreted - he do task - but it hurts - so you get no fun at all ! So it is no reason to force it all the time. But let it be like some small burst.
What you really need and can do is:
In a lot of game LA is auto - or is not used at all - only skills. Manual La in TESO is a really good thing ! It some times even fell good. But it do to much DPS for now - so you are forced to do it. If you nerf it - you destroy a lot of builds - so it is not even an option. But you can buff all other players. Who are other players - those who do not press LA.
So for not pressing a LA after skill you can give buff to players next skill or HA damage for 10% for 1 second. how will it work:
a) If players rotate perfectly - he will not get this buff at all. So his damage will be the same like it is now.
b) If he do mistakes - each time he lose to press LA - his other skill will do more damage so DELTA betwin more exp player and him will be smaller ! Exp player will be better but not that much.
c) For HA builds that use all LA/HA/Skills - HA is o loose of damage. We press less skills, but do more damage with HA - that is like spammable for us. So we try to get more slots on panel for support/controll and etc skills. Our rotations looks like 4-5 HA+5 skills from main bar - 3-4 skills from back bar with 4-LA. So we press 8+10 buttons in 14 seconds rotation. And i do not see any reason - our damage be less than a player who press just skills (10-14 buttons) - because we press even more ! Yes we get sustain from it - but we are more open to get damage in this moment (we do not block) - and we move slower ! So just buff all the damage after HA for 10% as example for 3-4 seconds. And such model be very balanced. Do not do any other changes for HA for now.
No builds get damage this way !
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Next problem will be - players do good damage ! They can easely pass some easy trials - what to do ?
Players damage is not itself to big ! Solo players is not a target for get nerfs ! The current problem is - that not about skilled players do much damage ! Solo players are OK - a lot of different builds are OK !
META - IS A PROBLEM !!! What is META - it is thing - that force players put on sets and skills they do not want ! Do not let you use your favorite builds and sets ! It is the thing that have to get nerf ! Really big nerf ! And it is a way to do it - but not to making players unhappy !!!
Because of it - just a NORMAL GOOD players get nerfs each update. And this is the thing that needs nerf - not players, not our DPS !
What is META and how it works - it is buff sets in game ! If it is 12 players with 12 buff sets that each gives 5% to damage = even if this players have each 80k DPS - this party will have 60% MORE DAMAGE !!! So the same skilled players will have 600k DPS on group or 900k DPS on group ! It force you put on sets you do not want - play the way you do not like !
And if OK for new trials (that only only enter the game and is not yet nerfed) - may be it is some thing OK - but for old trials - that was not designed for such big damage - it is a problem = becouse bosses can do nothing - they die before it appears !!!
Not because of damage - but because of tons of buffs. It was not to much buff sets before - so PLAYERS BUFF SUSTAIN - if we make builds like HA do normal damage it will not be META - it will be near the same game play. So it is healthy for the game - to make sustained buff sets not so usefull !
The same time it is to many buff sets already !!! In time when MOL exist - no such many buff sets ! Now it is tons of it.
And i do not say it is bad - it do not make much difference in dunguans as example. but in trial where 12 players can put it on and force you do the same ! it is overpowered - and make you unhappy - becouse you do not want to wear it !
Buff sets do not need to be nerfed - it is good as it is now.
BUT just add "Corruptor/deflect of Magic" buff to bosses already !
What is "Corruptor/deflect of Magic" - and how it works ? It punish to much buff and debuff sets. For each unique buff or debuff on the boss/group - it gives mitigation to boss.
As example - 5 buffs on party - boss is 10% more FAT (get less damage).
10 buffs = 20% more fat.
10 debuffs = + 20% more fat.
So buffs will be effective - but not as much to force people use such sets. You can desighn "Corruptor/deflect of Magic" for old trials - to make it more powerfull and remove it or make light fo some others - by just changing this % of damage reduction.
(Unique buff and debuff sets produced - do power of the "Corruptor/deflect of Magic" stronger, or may be some effects to then can be added to this list).
So you fix the real problem ! No one get nerfed - and content will be possible to pass !!!
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For PVP do not remake sets and skills for now too ! First look on healers sets ball group use ! There is the same bug in it as in azurblight before in 2021 year some where !
It will make skills press - and some sets will not even need to be fixed - becouse they are not much danger if game do not lags !!!
Then do nott nerf everything - but make it work more like LOR and real human logick ! just as example - if NB is not visible - his blood fall/burning and debuffs are. So let such enemy be traced by exp players by see some effects - and than expose them by direct AOE hit or detect skills as example.
Do not nerf a lot of class skills - but buff some of them instead - but give each class skill to easely counter it ! You make game only better by make counterplay not standartization and nerfing players !!!
Other way game becomes boring and unplayable. All you need to make it be fun for a different players. Now you nerf a lot of players but it is no need in it - the REAL PROBLEM IS DIFFERENT.