To me it sounds like you don't like the work you do, and going to university to do an undergrad won't get you a better job (assuming you still want to work in tech?). The best way to get a job you might like more is to learn some new skills and pivot your career.

I'd also like to mention that going to a prestigious university has generally no bearing on the jobs you get, it's the people. As a result hiring companies (in the tech sector) don't really care where you came from as long as you can prove your value.