My first idea was to use the Gitea instance of the Free Software Foundation Europe, but T&Cs strongly encourage only projects with direct relation to the FSFE activities, so personal projects don’t seem welcome.
The first-party Gitea platform seems to be in risk of becoming for-profit.
I can recommend Sourcehut, it’s still free right now: sourcehut.org You will need to learn how to use Git with email, but that isn’t a bad skill to have anyway, so why not.