How do I maintain my 3c hair?

I would say I have type 3c hair but I never wear it out because I really don’t know how to care for it. I’ll always have it up in a tight bun even if I’m just at home. I don’t hate my curls or anything but I can’t maintain them whatsoever, after laying in my bed for 5 mins my curls will look more like furbie hair or when I wake up in the morning I’ll look like a trollz doll and I don’t know what to do. How do I maintain my curls throughout the day and night? I’m tired of rewashing my hair every morning :/