How do you take care of the crown of your head?

My hair is on the thicker side, but it bothers me that the crown of my head looks a bit sparse. It looks especially thin in photos. I have really thick hair, so why does the crown look so bare? I use anti-hair loss shampoo regularly, but I'm a little worried if that alone is enough to manage it. I'm even wondering if I should start visiting a doctor now. Do you have your own personal tips for managing the crown of your head?