Checkout OMSCS if you haven’t already. It’s an affordable online MS from GT. No other program has the variety of classes at such a low price, not to mention a great reputation. With a stem BS you shouldn’t have too much trouble getting in. May have to take a prerequisite (DS&A) to improve your chances.

I’d avoid the post bacc path just because of their crazy prices. Definitely avoid bootcamps.

You’re in a rough position because you really need income. I’m tempted to say go bartend part time and do OMSCS “fulltime”. In two years, possibly less, you could be on your way.