Welcome to the forum! It would help to know what country you are from, though!

Thailand has a large number of international schools, so your wife's employment prospects are considerably higher than yours. I'm not sure how good salaries are, but they are definitely better than being an ESL teacher. That might be the best prospect for you, if you got a TEFL certificate. I don't know whether you will get employment rights if your wife has them. You couldn't get them as an ESL teacher without a degree or several years of experience. A lot of people work illegally, but that is becoming harder.