Unfortunately the only way to change that requires work. If community is dead it won't become active unless someone will post there and we might need to be the ones to do it.

If you have some community that you would like, start posting there (if you don't know content you can copy from Reddit) as long as there is content and people interested in it, it will grow, but someone has to do the dirty work unfortunately.

In the beginning it might be better to create generalized communities that encompass multiple topics so it would be easier to find people. Not start with very specific ones. That's how Reddit grew.

same, some tgc games, catching up on drama on certain tgc industry like mtg. PTGC, things that involves plants, animals, and a nich yt channel, location based subs.

Exactly there's a lot and I mean a lot of very specific niche communities that you just can't find help with issues on any other platform. Especially stuff like health insurance denials and stuff like niche hobbies. I personally am pretty upset because they banned me over essentially nothing. And yes while it is my own fault because I had more than one username and posted in a community that I had been "banned" from a secondary username. I had absolutely no idea they would completely obliterate all of my logins and make it so I absolutely could not use Reddit at all. The IP banning nonsense should be illegal on a platform as big as Reddit, YouTube, Facebook, and Google. When they are essentially the biggest social medias they should not be able to ban you permanently for things that are basically nothing.

What Threads is doing is an old strategy of embrace, extend, extinguish.

Google did the same thing with XMPP. When it joined it was welcomed then they introduced incompatible features to encourage existing users to switch to their GTalk. Eventually they "accidentally" broke communication so anyone on XMPP couldn't talk with users on GTalk and effectively killed XMPP.