To comment on the possiblity of regrowth it would need evaluation to assess the extent of damage. If the baldness has progressed significantly , medical management will not suffice and you might also be in need of hair transplant, apart from other supplemental procedures like microneddling and PRP, to achieve good results. Hair loss is a progressive problem and if not tackled in time tends to keep worsening over time. There are various causes of hair fall. Read my health feed for a better detailed understanding. https://fit.practo.com/#!/content/28405 After reading this I hope you will be convinced that a proper thorough examination of your scalp from a qualified dermatologist will be advisable for a fruitful outcome. You can drop by my clinic or meet any other Dermatologist/Trichologist as per your convenience and get further evaluation done. Hope this was helpful.