The days of living here on a tourist visa and border runs (not including Runs for multiple entry visas) are done. I admit that I lived here from 2013-2014 on back to back to back TR… no one is getting away with that now
Short answer: if you aren't working here, you aren't going to get that Long answer: you must be working, but with marriage to a Thai the pathway is significantly easier but is based on a point based system where one must get 50 out 100 points to qualify...however, if you are a woman married to a Thai man, it is ridiculously easy. Someday they should level that playing field...
You could get a TEFL certificate, you dont necessarily need experience to be hired. The thing is though, most people I know who have jobs in Thailand have some sort of backstory, i.e., they married a Thai and went to live there and after while got some luck and found something that was a good fit for them, or were hired by a company and transferred to Thailand, something like that....It's not impossible, but it's not necessarily easy either