Anything help cover a transplant scar?

[Kansas]

I had a Hair transplant procedure about 5 years ago and now regret it. My hair has continued to thin. I use Toppik and it helps a lot, but I feel a slave to it. I wish I could shave my head and be done with worrying about how the wind blows and getting Toppik on my pillows. I have thin hair, even where there is lots. You can see my scare a bit, but I cover it with the Toppik. I wish I had never got a transplant and just shaved my head. Now it's too late. I don't want to shave down completely. I have never used a guard to cut my hair. I don't know which would buzz it without needing a razor. Is there any product out there that I can put on my scar to mask it? Thanks!