Lemmy already superseded my expectations with how active it is. That being said, I would love the following to see more action (although I'm mostly lurking there myself):

!nba@lemmy.world - Loved the discussions on Reddit. As a European, it's not easy to follow the games, so that was a great way to stay up to date.

!criticalrole@lemmy.world - Mostly carried by /u/Ultragramps@lemmy.blahaj.zone, whose updates are *chef's kiss*

!quackers@lemmy.world - No explanation needed.