With a minor in CS you should have been a plausible candidate for at least some if not many CS jobs. I’ve also known math majors that got CS jobs that required deep mathematical competency. You also hint in another reply about struggles in college and mention UT wouldn’t admit you to your desired ME major. Did you try to transfer to ME and get turned down? Was your gpa low when you were looking for jobs, and what happened on the interviews?
My concern is there are other reasons you haven’t found work that you want, not just lacking an engineering or CS degree. And that returning to school will just kick the can 2-4 years down the road but leave you in about the same position.