No matter if the system you put is good or bad. It will have damages. Changes of that magnitude are not well received by most.
Mandatory Changes
Crown p/month subbed: from 100 to 500.
CP points p/v14: from 70 to 99 (33 on each constelation)
CP point gain: from 400k xp to 200k xp
Optional Changes
Defloat numbers: 20000 magicka to 2000 magicka.
Raise CP perk gain: from 1%, 1,5%, 2% to 5%, 10%, 15%, 20%, 25%.
Raise softcaps, so one has to try really hard to cap a resource but it won't be monumental like it is now.
Bonus Changes
Since the system is restarting anyways, race changes free with chance to redesign your character appearance.
Allow name change in crown store.
Remove VR forever.
Open all factions to all levels.
Use achievement points to covert to CP.
Make sure all sets got attractive bonuses. 2% critical is okay, but look at some 5 piece effects or combinations that benefit stamina more.
Add stamina regen to a mundus.
Bring back RP food/drinks.