ESO Plus as it stands is completely lack luster except for the access to all future DLC (While subscription is active) and the 1500 crowns you get upon monthly renewal of your membership. I do know some threads exist when pertaining to this matter but I just wanted to share my in-put.

10% EXP gain is pretty negligible at it's current stat but alright I guess.
The increased gold find is completely useless as you usually make the majority of your cash through buying-selling in guild traders or with other players.
10% reduction in research cost is completely and utterly horrible, I suggest they improve it to 30% if not 50% (50 is a little high but one can only hope).

I know crafting bags are coming but why not some cosmetic lore friendly stuff like cloaks,scarves,and capes as they are all lore friendly (going by the box art at-least). They would pretty much be like a guild tabard but you can customize your own emblem with colors (you would use the dyes you unlocked to customize the color of the cosmetic cloaks,scarves, and capes).

There could also be a ESO + bank space which provides you with 50-100 spots while being a subscriber and let's say for example you no longer wish to subscribe well the items would remain in that space where you would only be able to withdraw or deposit like items that are stack-able e.g. materials.

You could have priority over everyone else when it comes to getting into cyrodiil. Let's say the campaign is full and normally without subscription you may have to wait for 30 other players to go well with subscription on you now get a expedited premium wait time which moves a lot faster. Example premium wait would be 5 players compared to waiting for 30 other players who are non subscribers.

How about subscriber based emotes (lore friendly if that's possible). I'm not sure if this is lore friendly but how about a slow clap with your head shaking back n forth slowly in disappointment, I know a lot of players who would like that emote for taunting or just expressing their disappointment in their alliance or team mates.

Exclusive trophies (lore friendly ofc), maybe trophies about different princes/princesses for example boethiah, trinimac, etc. The trophies would represent a symbol that the daedric prince/princess is known for.

Exclusive subscriber dyes and maybe costumes for those who have a long tenure with ESO plus.

Sharing the love. For a period for 2 hours you could possibly share the subscriber benefits with other players of your choosing thus making a "It was good while it lasted" kinda feeling; this would entice players who are not a subscriber to subscribe to the game too. The cool down would be either once a week or once every two weeks.

Rare drop rate increased (non share-able). You'd get a potion every week or two that lasts for two hours, during those two hours you'd get increased drop rate on rare items. The potion it's self would obviously be non-trade-able or stack-able. The cool down for drinking said potion would be once every 6 days.

That's all I'm going to put but I do hope ZOS takes a look at this because I do want the game to flourish even though they nerf the only and most favorite class over and over again (DK); nevertheless money makes the moves and the more subscribers the better and faster things get completed. @ZOS_GinaBruno