[2021] What single change would keep you engaged in this game?

I was thinking about this over the past few days as I'm really forcing myself to play even 5-10 minutes per day for my clan's benefit.

I realized that the #1 change that would actually bring me back fully on board and probably addicted as much as I was in the early days would be secondary abilities of the characters. They wouldn't have to release all of them, but could trickle them out. For example, ice wizard could have a one-time icicle throw (as a hypothetical example).

I just can't think of anything else that'd keep me on board longer than the end of this season (e.g., skins won't do it, a new card won't do it, larger prize money pools for the pros sure as hell won't do it lol).

I'd be interested in what would be your genuine number 1 "Wow, this changes everything!" addition/modification to the game?