Of course, it's fine for people to be lurkers—I was one in the vast majority of the subreddits I joined—but the advice I'd give to everyone is that if you're upset that there's not much content or that something isn't being talked about, make that content! That's been the approach I've been using. If I think, "Man, I wish there was a post on this," I make that post. Again, it's understandable for people to lurk, but I do wish more people who were dissatisfied with activity tried to help fix the issue as opposed to abandoning the concept of the fediverse or using it much less.