I had hair transplant but my hair did not grow (Photo)

I'm 21 years old. I did a hair transplant. It seemed to be success. But in the 6th month, I found that my hair wasn't growing enough. I consulted the doctor about it. He told me to look at his blood values. İ had b12, Fe, Zn deficiency . I'll take them now. Do you think that's why my hair doesn't grow out, or is there any other reason behind it? And when I get these, will it come back? I'd appreciate it if you'd give me an emergency return:)