Is your hair also dry?

Assuming the hair isn't irreparably damaged, try a protein treatment (will help with droopy curls) followed by an intensive deep treatment.

Do you know any of your hair properties, so I can offer a more specific recommendation? Things like porosity, strand width (fine, med, coarse), etc.

By the way, "only washing every 3 days," is not particularly descriptive. What products are you using? Low-poo? Conditioner wash? Sulfate wash?
Hair Type: 3c/4a, Med-High Density
CG since '09