I personally think that the main problem is bad search optimization. There quite a lot of good answers on Fediverse (Lemmy) but it is nearly impossible to find them via Google or any other regular search engine. And making things worse since Lemmy is Federated it is not easy to implement correct indexing for it. So it makes a lot of questions(Should each instance index only local posts to prevent duplicated search results? What about small instances? Or use some central instance like Lemmy.World? What about different frontends for same instance like Photon or Alexandrite?).

Try to rephrase the question: is there an alternative to Mastadon in Fediverse where you can write posts in different threads (not only in your own feed)?

Discord and Matrix is more messangers and “groups chats” when Telegram Channels similar to Mastodon but with specific topic