How To Get Thicker Hair?

at 50 I am healthy and normal blood work. test levels at 300-400 ng/dl so happy with that, no medicines needed and very slight thinning of hair back of head...most folks would say no big deal but I always have had thick hair.....wondering if 30 years of on and off light usage of cannabis has messed up the testosterne/estrogen balance or thc has a toxic effect on hair follicles...I would hope quiting would reverse matters