In my case, as I'm mainly on Mbin, when I get to host my own instances (life got in the way when I tried...), I'd probably make, besides the new Mbin instance:
- either a PieFed or RSS Parrot instance for having RSS posts as fediverse posts
- a Peertube instance for videos / audio (?) / shorts
- maybe some Lemmy instance and a Mastodon one for tests
- a NeoDB instance since it's the most unique type of content not handled by the softwares above