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Self hosted FOSS software
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Personally, as well as NextCloud, I'd host instances of LibreX, CloudTube, PiHole, Gitea, XMPP, and CryptPad.
If it's fun you're after, though, why not try hosting a Minecraft server? And how about XMPP or Matrix, to keep in touch with friends?
What's your xmpp server of choice?
I haven't really looked into it much, as I don't currently have enough time or money to self-host anything, but I'd probably go with Prosody to start with.