So I'm in act 3 and I have level 12 + 33k XP.
Game should support more levels past 12, but I also understand the extreme power this would give to players. This also includes a possible DLC or maybe more zones in the DE one day.
So here's my suggestion:
1. Max level per class stays at 12
2. Max level is increased to 20, but you have to do multiclassing past 12
No more power creep, but multiclassing endgame would become a real form of art for theorycrafting, etc...
And the DLC would become entirely possible, as well as (re-)adding things like Upper City, Avernus, etc...
Sounds good?
Yes, I thought so!