I'd personally just like more zones open.
The Level Cap might help me progress through the current raid tiers easier but then was that me "gitting gud" or was that the level helping me cheat?
I think we had another thread with zones people would like to see opened up, so how about something like MPG as a questing / hunting zone with Riftseekers as a new Raid tier?
I know alot of people would like Time open too but, though ive never been I imagine the place is huge and thus would take an insane amount of time and work to populate with Raid bosses.
But i've never been to VT either so i don't know how big that place is or how long it took.
Another option would be maybe do a mini raid zone in Riftseekers and while it takes the players here time to complete that, work on something bigger

People could be farming that for weeks / months giving some time.
Of course these zones are just an example and it could be any number of them. Crypt of Decay + whatever the one that followed (i don't remember the name) would be cool too, i would finally get to use my Slay Undead AAs but the zones aren't exactly "pretty" or particularly fun to be in.