Are you already taking hair vitamins, drinking plenty of water, working out regularly, deep conditioning regularly and not using any heat? Is the rest of your hair healthy, moisturized and properly conditioned? Have you applied a topical growth aid to your hair?
Have you applied vitamin E to that area on a consistent basis? Did you have any haircolor in your hair at all?
These are things that I would ask myself if one section of my hair appeared stagnant.
OP, looks like traction aloepecia. Maybe make an appointment with a dermatologist.
I would take those braids out and avoid them until you start to see growth again. I used to get braids a lot and my edges stayed thin until i started prepooing with hair trigger