And like virtually every one of the similar complaints, this comes from someone who isn’t otherwise active, so basically boils down to “I’ve noticed that other people aren’t providing me with enough content. What can we do to get other people to provide me with more content?”
If you want to get more activity in niche communities, POST! And not just once - do it again and again, day in and day out.
The communities that you appreciate didn’t just spring into being - they grew, over time, because people did exactly that.
And I stand by everything I said there.
And I also believe that the threadiverse will continue to grow overall.
And I don’t believe that those two things are in any way contradictory.