Proper nutrition, avoid heat (curling irons and straighteners), Biotin and patience.
I have a T of 25 ng/dl, take AA, oral E and finasteride and I have had significant regrowth.
Hair grows in waves or periods of time. Only 10% are in a growth phase at a time.
I have a micro dermal abrasion wheel which increases the effectiveness of topically applied products 1000 times. I have been told vitamin c, cinnamon and melanin and the micro abrasion wheel can induce hair regrowth. I do not know because I am afraid of causing an infection and I am just now recovering from an episode of using liquid vitamin C (which colors your hair yellow).
I have not cut my hair for 13 months. A coworker (female) from behind felt my hair today, I turned and we both smiled

We then chatted after a meeting, Hair can be such a conversation center piece.