A degree in Applied Math makes you qualified for DOZENS of roles/career paths which are scientific and technical in nature.
Have you met with a career counselor at all? Have you sat down with one of the career services folks at UT to review your resume and figure out how to tweak it, and done a few practice interviews to get feedback on why you “fail” the interview?
It seems like more education is not the answer- getting back on track professionally does not require either another Bachelor’s (which rarely pays out) or a Masters (which would- but only if you know exactly why you are going and what type of job you are preparing for).
A 15 week coding bootcamp would be faster and cheaper than a Master’s degree and could get you to the same place, depending on what you want to be doing…
Data Science- look to a certificate program. You don’t need a degree in it since you already have a degree in math- which is the hard part.