I like all of the ideas except for hospital opening. Maybe only for lvl 1-20 players only as stated. I think the hospital closing adds some extra strategy and thinking ahead for the game.
But as for priorities, here is what I would like to see prioritized:
Inventory Revamp (Original Post)
It's quite a bit of work but I'd still love to give all players far more item slots and add a proper drag / drop / stacking system to inventory. Maybe with nicer controls for combining crystals and socketing items as well.
Warfare Shop Items (Original Post)I think this idea is needed as current Warfare Point rewards are mostly irrelevant. I'd like to see new items that cost a small fortune go up but are viable alternatives to Ventrix's items.
After that, I think the arena/raid system sounds pretty cool.
Rogue WL sounds interesting, but I don't think it should be a priority.