1. Create new dungeon content more regulary- stop reskin old bosses and old mechanics
2. Create mechanics that force your group to work together - instead of make it hard for either tank, heal or dps.
3. Create more raids - raiding is fun and helps the community to grow together - in some cases atleast.
4. Stop creating non-dungeon content that is a lot more rewarding than dungeons. This is an MMO - not a worldboss farming simulator.
Arigato