I think it's the same problem as Threads. There was a rush. Then those people who rushed in either quit or only focused on the popular kids (figuring engaging them would rub off on their engagements). The current places with actual engagement for me are Tribel & Mastodon. Though both dropped a lot.
I get that. I made a mistake initially and started over, then realized I didn't have to. But the split domains is why I like it, because my domain admin blocks trolls and entire troll servers regularly. I almost never block anyone on there.