Wow this is the problem with me. You simplify it. So my next question is how to tackle this when there is no short term benefit? How you get motivate yourself?
If you can't do that, sign up at a university.
I've considered signing up for classes before but instead I find coworkers or friends interested in the same subjects as me and we do online courses together. Groups are a helpful tool to keep you (and others) moving forward for sure.