I think one of the most important things you can do, given the skills, for a software freedom future is: Make movies & other entertainment!
Seriously as long as we're relying on major corporations to entertain us, they will be pushing proprietary software & DRM on us.
Also it's a good way to communicate our concerns, but ultimately all that's important is to have (more) great DRM-free entertainment for all to enjoy!
No coding skillz required.
Something you could do along these lines (whether you view it as practice for telling your own stories or not) is to modernize or remake the public domain movies that are now (finally!) etering the public domain. Soon the 1930s will be entering the public domain, so there'll be plenty of great choices!
(Currently anything <=1925 is indisputably public domain)