To add thickness, can a hair transplant be done twice on one place?

Dear padgolThanks for the question. Typically, it's best to avoid consuming alcoholic beverages for at least 48 hours after surgery. Even if you do consume alcohol, be sure to go easy. I wish you all the best.

It can take 6 to 12 months after surgery to see results.  Some may see hairs growing 3 months after the surgery.  If you are concerned it is best to contact your doctor.  

5000 grafts seem like an extreme amount of harvesting as it shows on the photos you provide.  Based on Dr. Rassman's article it would seem it is over harvested. 

Facial hair growth is a genetic trait.  If you have very little facial hair there isn't much you can do to increase the growth.  L-lysine is not a DHT blocker.

It can take 6 to 12 months after surgery to see results.  If you are concerned it is best to contact your doctor.  Signs of a successful transplant is when you see the results and you are happy with the results in 6 to 12 months.  There isn't much you can tell in 14 days.

Grey or white hair is a genetic trait.  Transplanting hairs will not make your hairs black as the black donor hairs will also turn white.