Codeberg runs on Forgejo, which you can selfhost. (If you wanna try, let me know, I can create an account for you on forgejo.world). It has (or will have) activitypub (federation).

Friendica is nice, I’d say try it (friendica.world?), but host it yourself if you like it. Personally I use Sharkey (sharkey.world) which you can use like Mastodon, but with longer posts, and you can create pages (like this one ruud.social/@ruud/pages/postgresql ).