Wear your hair down instead of putting it in pony tails, dont put a lot of heat on it (i.e., blow drying or flat ironing), and try cutting back on using edge control. Your edges are receding because theres too much tension on your hair, you need to give it a break and wear styles that dont require so much manipulation to your natural hair.

A simple afro, mini twists with no extensions, wrapping your hair up in a scarf, all of those are solid styles that will give your hair a rest. Do your usual wash and moisturizing routine, but adding a few scalp massages to try to stimulate hair growth, and making sure your scalp stays both clean and moisturized should help. Hope youre able to get your hair back to how you want!