Can I fill in this thin area? (photo)

I really don’t understand but my head looks thin. Is this something that can be fixed in some way? I had a hair transplant one year ago.

The density that you need to know is your donor hair density which will tell you how much hair can be moved to cover the area shown in the photo with hair transplants?. If you don’t have enough hair in your donor area (something your doctor can tell you), there are alternative treatments such as Scalp Micropigmentation (https://scalpmicropigmentation.com/) where you can shave your head and have the appearance of a full head of shaved hair.