A master's should qualify you to teach at community colleges, no?
I was in a similar situation, liberal arts masters degree, not using it at my dead-end office job. Had taught college for two years during grad school, but that was years ago. I couldn't find any place that would hire me full time without more teaching experience. I took on a Saturday class at a private tutoring place.
Perhaps anti-mustachian, but I ended up just quitting the crappy job (life is too short to waste, I had enough savings to cover me for awhile), and then picked up one class, two classes, etc. because my schedule was free to do whatever. I eventually transitioned to community colleges "full-time."