- Find an open-source software that you're interested in, but your main distro doesn't provide it in the official repo. Be a packager for this software.
- Open your distro's wiki, rewrite (or contribute, if already good enough) a page or section.
- Try the bleeding-edge version (or very-early testing) of your favourite distro, and submit some test results, regarding to your hardware.
IMHO these tasks are interesting, could learn a lot from these tasks, and other linux users could benefit from these work
I had been using WSL2 for about one year. The experience was terrible compared to a Linux host. (Sadly I can't change the system on my work laptop). However, it was much better than Cygwin, msys2 and powershell - based on my experience.
If your host OS is windows and you're interested in Linux, I think WSL2 is a good way to have a try