This is one of the biggest opportunities in recent years for a new social media platform to come up and establish itself and Lemmy seems to be totally squandering the opportunity. The fact that the active user count is dropping so fast, should be very worrying.
I think a lot of it has been mentioned by @rr7@lemmy.world, but it isn't just what is here, but also what isn't there. Namely the lack of posts in communities outside a handful of political ones. Social media should be some form of conversation and yet if you go to lots of the slightly more esoteric communities and there are few posts and even fewer replies to those posts. You'll basically be talking to yourself if you want to talk about cars or the latest gadget or asking for help on some DIY project.