On the Lemmy specific front, Active daily users seems to still be stabilising following the exodus from elsewhere, Comments and Posts both seem to be on the rise though – promising stats all in all.
Biggest thing I think that needs to get worked on though is to give smaller communities better visibility. You almost never see them because they get buried by the popular communties.
The devs are aware of this and, I believe, have a feature coming to help with that. In their recent AMA they acknowledged that it's bothering them too.