That can depend on the overall levels of inflammation in the body. As the inflammation decreases, the potential for new hair growth should increase. Using apple cider vinegar on the scalp can help. ACV helps to restore the normal pH balance of the skin to one which supports beneficial bacteria and hair growth. Apply ACV about 10 minutes before you shower and just rinse off. Do not use a shampoo.
As the beneficial bacteria and intestinal flora balance improve, your absorption of nutrients to support hair growth will also improve. Consider a product with Tocomins in it, as this has been shown to support regrowth of hair where the follicle is still in place.