Forget PRP - won’t do anything. A multi vitamin won’t hurt you but it’s not going to save your hair either.
Finasteride over minoxidil if you only want to take one medication, but both is always better in combination. You’ve got oral & topical options for each, with oral being more effective. The key is to see if you can tolerate the meds without any side effects and, if so, stick to them long term.
The other thing if you haven’t already is to just buzz that hair off and rock it. It’ll look far better than the balding look, and you may like it enough to move on without having take medication and put yourself through more than one expensive surgery. It’s risk free, cheap and convenient (and universally looks good), so should be done first as part of the process.