Well, there's not much to do that can be stated. Most of it has to be made up using imagination. Roleplaying, chatting, making movies and exploring are pretty much the main things to do, which I'm sure you know. Being a year and a half into FeralHeart, I doubt there's any more exploring you can do, but the others can still be enjoyed. Join a new roleplay?
If you're creative, why not make maps, presets and meshes? I have many friends who enjoy creating things they and other users can use.
Otherwise, you could create yourself an interesting new roleplay. Perhaps even make your own species and make a preset for it. You could make a map suitable for the species, make up a hierarchy, make a website; anything, really.
Ultimately, there are loads of things to do on FeralHeart to do, you just have to think them up. c: