My hair looks shiny on day 1 but dry and dull on day 2… any fixes?

Every time I wash and style my hair, it looks great the first day, shiny, smooth, healthy. But by day 2 it turns dry, dull, and kind of crispy at the ends?? I don’t want to wash it daily because it makes it worse. I’ve tried using hair oils, serums, leave-ins, even sleeping on silk pillowcases. Still looks dead the next morning. Does anyone have a product or routine that keeps hair looking healthy beyond just wash day? Especially for people who style their hair or use heat regularly.