There's a lot of fun projects you can contribute to in the Linux Desktop space. I own the code in the GitHub orgs altdesktop <https://github.com/altdesktop> and dbusjs <https://github.com/dbusjs> and I'm very responsive on issues and pull requests. Another great community is sway <https://github.com/swaywm/sway/> and i3 <https://github.com/i3/i3>.