Literally millions of people are in similar position. If there was a universally applicable solution to this, it would get flooded and quickly become not so goo

Literally millions of people are in similar position. If there was a universally applicable solution to this, it would get flooded and quickly become not so good anymore (see: the indie apocalypse in game development). In my opinion, the best approach is to cultivate some passion and hope it will, years down the road, grow into a something that brings income. If it works out, you'll be a very happy man (getting to sustain yourself with your passion), if it won't - well at least you'll be amazing at what you're passionate about.