My "niche" is resource gathering.
Anytime I'm in a group online, I always am the gatherer. Caving, mining, logging or making expansive crop farms... I'm all about filling chests with everything you can find.
Oh, and making organized storage rooms with a theme.
Literally everything else I fall flat on my face and I don't mind. I've been playing since mid 2010 and haven't stopped. As long as you're having fun, that's all that counts.