Does green tea or pumpkin seed oil block DHT and fix miniaturized hair?

No, there is no evidence that green tea or pumpkin seed oil effect hair growth.  I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

There are thousands of home remedies for hair loss, 99.9 make no difference. I would suspect that these would fall in that category, although I haven't read any studies one way or the other. Try propecia minoxidil, PRP or Laser, they all have been shown to help hair loss in some patients,Dr. Robert Jones

These agents have only been studied to a limited extent. Better evidence clinically exists for pumpkin seed oil than green tea. Please keep in mind these have a limited role in treating male balding (if they truly have a role at all). They may slow down balding, but no, they are not going to fix miniaturized hair.