So you're saying there's a space from roots to where the curls start that is straight? And you want it to be curly at the roots?
I don't know what styling product you are using, but you might be weighing your hair down which can create that straight section. Try switching over to a mousse or something lighter and really focus on scrunching the product in that section.
I love layers, but I would only really recommend them on someone with really thick hair. If your hair is medium to thin, it might make your hair look thinner.
Long, Coarse, 3B hair.
High Porosity, Very Thick.
Low Poo: Any Suave Naturals Shampoo.
Treseme Naturals Moisturizing Conditioner.
Biotera Firm Hold Styling Gel.
Still trying to find what my hair likes