Can I grow back my donor area grafts? It's very weak after transplant (4000 grafts), I feel extraction was not up to the mark?

hi everyone, my hair transplant operation After two sitting of FUE (4000 grafts), gap between two sitting was 40 days, now my donar area is very weak, i had not inquired much my doctor before operation, now i am realizing my extraction was not upto the mark + doctor as well, even i am not seeing any visible result of good hair growth now 60 days has done, i am very worried , bcoz i understand grafts are equal to diamonds, pls give suggestion or any kind of treatment to grow transplanted hairs.