Falling off the ladder, with no one to help me up

I'm a teacher. I've been in education in various capacities for the past 14 years, but haven't worked a decent full time teaching job since 2012, when budget cuts left me without a position. Luckily, at that time, I had my husband's income flow, so it wasn't as devastating as it could've been. Fast-forward to 2017, when he and I separated; I was finishing my MA in order to make myself more appealing to local school districts (we're required to have a Masters by year 10), and even earned an additional certification on my teaching license. I was substitute teaching then, and eventually added a part-time position at a local university. It's now 2020. I'm still subbing, and still teaching part-time at the university. I'm still without an adequate income. I have a child to care for, a mortgage to pay, car payments, student loan payments, and credit card payments (thanks, ex husband!) to pay for. I've applied to 16 different public school systems, 5 universities, and hundreds of federal and corporate jobs. NOTHING. I don't know what I'm doing wrong. It just seems as though because I'm in the situation I'm in, people are reluctant (read: not at all interested) to hire me, which is just keeping me sinking further and further. "Get in as a sub--that'll get your foot in the door! You're sure to get a full-time job then!" Nope. Wrong. "Apply to the government! Teachers have all sorts of transferable skills! You're sure to get a job!" Nope. Wrong again. And so it goes. I need help. And a job. Any insights, dear readers?