First time posting.

I have been perm free for nine years. After loosing my hair from chemo, I decided that I didn"t want to use chemicals. I did twists for years and decided to wear it straight. Now I am wearing it short. I have type 4a hair and it feels like cotton. Some spots are real tight and some of the ends are straight. What products can I use to get a nice defined curl? Is there any hope?