The Fediverse is not only Lemmy and Mastodon. Even the microblogging side is not only Mastodon.

Mastodon itself has a whole bunch of forks such as Ecko, Hometown and the very popular Glitch.

There’s also Pleroma with its probably even more popular fork Akkoma.

There’s Misskey with literally dozens of forks, including but not limited to Firefish (formerly Calckey), Iceshrimp (its rewrite Iceshrimp.NET won’t be a fork anymore, though), Sharkey, CherryPick, Catodon etc. etc.

If you want something with more power, something that’s much more like Facebook, there’s Friendica and has been since 2010.

If you want something with vastly more power, think Facebook meets WordPress meets Google Cloud Services meets Fandom etc., there’s Hubzilla. Whenever someone thinks “the Fediverse” needs to introduce a certain new feature just because Mastodon doesn’t have it, chances are Hubzilla has had it for longer than Mastodon has even been around.

And so forth.