I would recommend a trial of minoxidil
in your case. If there are viable hair follicles then the hairs can grow back with the application of minoxidil. However, if the cause was something else like alopecia
due to other cause like scarring then you might not get good results with the application of minoxidil. Anyway, you should take care of dandruff
in your hair adequately because hair loss can occur due to persistence of dandruff.