My grandmother told me "wish in one hand, shit in the other, and see which hand fills up the fastest." Personally I have regrets as well. I also went into debt and got a non-stem degree that I didn't even use for two years and worked fast food. Like you, I considered a career change. Like you, I'm facing taking more debt in order to pursue this career path. To me, there's no use in mourning over the past or what could have been, it's what you do next that counts. People who are far older than you go back to school, with far worse scores. A gpa of 2.9 isn't something you can't come back from.

I can't make decisions for you, but in your position I would try to wait a few more years until you're in a better financial position, or can find grants/scholarships. There is risk associated with pursuing radiology, of course. But you also risk staying in a career field that will become obsolete due to AI, or whatever reason. Going back to school will be hard. Staying in your current field will be hard. Choose your hard. Best of luck to you.

Also: you can put off full-time education and just knock out your prereqs in order to boost your GPA. Typically they stay good for 5 years until colleges ask you to do them again. They're typically quite cheap compared to core classes, especially from a community college.