How can i learn how to skateboard better?

I've been skateboarding for 6 years and the only trick i can land is an ollie. Ik i suck at skateboarding. But i can do a heelflip, varial heelflip, popshuvit, and bs 180 ollie but i have issues landing them. I try to learn how to skateboard off of youtube but it obviously doesn't help me. Also all my friends that are good at skateboarding quit so i can't ask them for help. So how can i learn how to skateboard?