1) Higher Level Cap
2) Get your plans out and made public, people need to know what the state of the game is and it's future intentions, the community is just holding their breath
3) Ladder System quickly, the game in it's current state needs to just be reset. Everyone needs to start on an even playing field. Every successful ARPG has had some sort of ladder system.
4) Hold weekly tournaments, such things as hardcore leveling contests, or speed runs of acts, something to keep people engaged with some cosmetic items and maybe some crafting mats or things like that, nothing gamebreaking.
5) The AH really just needs to be reset with a ladder system too, the economy is probably ruined for a very long time.