I have baby fine hair that just got highlighted. Scared about damaging, but the sides are slowly losing their curl, and I have tighter curl on top, so I need something to even things out.

Any suggestions? My hair is above my shoulders.2A

ETA: 2A on the sides and back, 3B on the top front area. It's been awhile since I've posted on this website (new profile) so I had to look up the hair types again!