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Have you tried out Firefish? It’s another micro-blogging site like Mastodon, but the UI looks better in my opinion. You can follow Mastodon users on there and a bunch of other Fediverse content as well. They’re still working on an official app, but the PWA works quite nicely.
A mini PC is the way to go if you want to self host a media server such as Jellyfin. You have to do a little research, but you can find mini PCs with Intel chips that have Quick Sync for transcoding for around $100 on Amazon.