Why won't my foundation stay on my face?

Good day, I'm curious to know why my foundation keeps sliding off my face despite my best efforts to apply it correctly. I've tried various primers, skin types, and foundation formulas, but nothing seems to keep it in place. Could it be that I'm not using the right application techniques, or could there be something else going on with my skin that's causing this issue? I'd appreciate any insight you can provide. Thank you!