Hair falling out after transplant a few years ago - what can I do about it? (Photos)

I had a hair transplant a few years ago along my frontal hairline and temples it has been mostly ok for a few years but now my hair is getting incredibly thin and I feel the transplanted hair is falling out too. What can I do about it? Are there any medications or treatments that can help or is it a lost cause and the follicles are dead forever? Very worried and self conscious