MFE needed for someone switching from premed?

Hi all, I have a biomedical engineering degree from GT and a recent grad (2 years out). I had been focused on trying to get into med school since undergrad, so I don’t have any relevant experience or internships.

I got really interested in the stock market and macro economy over Covid and with the most recent unsuccessful try at med school admissions, I’m contemplating a swap into quant.

Considering I have no formal education or experience in the field, should I pursue a masters? I’m not sure if I’d be competitive for a top ranked program.