It won't necessarily grow in curly once it's heat damaged even if you stop using heat as often as you used to/do. . . it doesn't work that way. I would say stay away from the heat, cowash/shampoo, condition as usual. Let your hair do its thing.

If you don't see improvement with that, try a protein treatment to see if that'll help repair the damage from the curling iron. If not you may have to eventually, gradually trim.

last relaxer; 082708, BC; 081810, CG; 122410
high porosity, med/coarse texture, high density, color treated
condish;TN, DevaCurl Heaven in Hair stylers; Heaven in Hair, DevaCurl Curl Cream oils;Castor Oil