I would say that you should get on finasteride so you don't lose what you have left. I'm going to be brutally honest, even with treatments, you aren't going to regrow a cosmetically good head of hair. You probably will regrow some, but you'll still look quite bald... I think you should look at what one of our members did, get a hair transplant, don't aim for thick hair because it won't happen with such a big area to cover and limited donor, but you may be able to pull off a buzz cut with a decent hair transplant. Perhaps if you combine with body hair transplants and/or scalp micro pigmentation, you can get a thicker healthy looking buzzcut, but with current treatment options, that's likely the best you can hope for. You won't be able to grow your hair out, but you won't look bald if it works out.