I remember this pic. When I see it I feel relieved that you were able to have the surgery you needed.
Your hair looks lovely now but since you want it to be long and healthy you should try to get a good brush and a good comb. When you untangle your hair, use the comb because it is less likely to cause your hair to break.
You can also use a good shampoo and conditioner that hydrates the hair - try adding a few drops of tea tree oil into the shampoo. Each week, do a deep condition using either coconut, almond, olive, avocado or Moroccan oil. I find that these work better than a store bought deep conditioner. Using Aloe Vera in the hair also improves its health and it does help it to grow too. Wash your hair about twice a week and let it air dry as blow drying can hurt the hair. If you do blow dry, use a heat protector spray - Tresemme has a good one.
Eat lots of fruits and vegetables and keep up with your proteins because these help the hair to grow.
I hope that this helps your hair to grow long, shiny and healthy!