If you’re looking for a free self hosted server - I have been using the oracle cloud free tier for months - especially their Arm based server, and I’m more than happy.
However, if you end up going that route have some kind of backup strategy set up, and set it up in a way where you can reproduce the server easily, as they reserve the right to suddenly take it offline.
I’m using a hetzner storage box for backup - which I also use for my personal automated backup with borg.