Hello Demortalizer here with some suggestions,
1st : You could try add a aoe looting system of some kind.
2nd : Do so all classes can be all the races like since i play shaman id like to go worgen or human.
3rd : Not sure if this one is good but add the MoP dungeon challenge gear sets for transmoggin, could be a loot from hard boss or a long quest line.
Kind Regards
Demoratlizer.