I would try leave-in conditioners, or, don't use shampoo for a while. I've found that, my hair is curlier when I just use conditioner in the shower. Try cutting back to using shampoo to just once a week, like I do. When you've conditioned your hair, scrunch it with styling mousse, and also, moisturize it with spray conditioners or gel or hair milks that help to prevent breakage and make hair shine, and preserve any curls/waves that may be there.