There are many other things that can be done in the game, namely:
1. Gearing up => Many end game gear require player to exchange certain item or currency, and the only way to obtain those things is mainly through dungeon, raid, or roulettes.
2. Crafting and Gathering => Very fun yet challenging.
3. Possessing house.
4. PvP.
5. Unlocking achievements & logs.
6. Collecting Mounts, etc.