I have a decent job in marketing with lots of room to grow but I’m interested in learning something new that i could use to generate some passive income in the future.

I recently started learning Python and I’m enjoying it but I’m not sure how feasible a passive income with that is. It seems more along the lines of a career type skill.

What other things could I better spend my time on that could help me earn some some extra cash in the future? Or would becoming proficient in a programming language open enough opportunities by itself?