Not using a hair style that pulls on your hair like that is the only solution. Otherwise you'll keep losing the hair. It's called traction alopecia.
It takes a lot of time for hair to grow back. If the spot is being stubborn, you may want to try Rogaine. Dont know if it would help or not. It takes 3-6 months to see if the Rogaine helps.
Other than that, I have no idea. I no how demoralizing bald spots are. Good luck.