I'm actually on the same path, I've built a SaaS website feedback tool, which started 4 years ago as a side project, but since Sept this year I've been working on it full time, hoping to reach around $3,000 MRR (currently at $900)

So far it's working, I'm way ahead of my target 7% month on month growth, so I'd recommend doing something similar - build a SaaS app that you can manage by yourself, and invest as much time as you can in learning marketing.

If you're interested I'm doing a completely transparent blog series about my progress - https://blog.bugmuncher.com/2015/10/22/from-side-project-to-...

Good luck!