I'm the kind of players who carries on playing the games according to the quests (mainly available through learning new skills). However, I reached level 15 and I have done all my quests (new skill pending), so what's left to me is discovering new places and collecting new achivements.
But achievements are hidden ! Would it be possible to see all of them to build new goals.
Other idea would be about introducing new animals unlocking skills (e.g sheeps=>knitting, fish =>fishing)
Sports ?