My hair is really thick, poofy, curly and ends up in a triangular shape when it dries. what should I do?

I have tried everything!! I usually just straighten my hair, but it takes a reaaallly long time. I have also tride serum, moose, and i even cut my hair into long layers. these things help very little as serum makes my hair greasy, my hair just puffs up when the moose dries and the long layers help only a little. Heeeellpppp!!!!