> I know going full-time into FOSS isn’t easy

What matters is whether it’s important. I spent a lot of time over the years doing FOSS and learned all that code just like all other code atrophies and dies. Maybe it helps you get a job (mine did), and maybe it drives part of the world. But, eventually, it’s probably not important. Don’t worry about FOSS as criteria for a job doing something that is transient.

If you’re so motivated though, be Richard Stallman!