Take it apart as you would to change oils and check over the seals/wipers. Relube seals if needed and refill oils to correct levels and see.

My 2010 Fox F120 RL was as sticky as a Walmart fork a decade ago even after riding it for 20'sh hours without improvement. The wipers weren't the problem, the foam rings were lubed, and the bushings werent overly tight. The air piston didn't have much stiction, but the damper one did. Drained the oil from it (open bath) and reassembled everything and it was 100x smoother. Don't know what was wrong with it before but if it's sticking it's worth just taking it apart and reassembling it/refilling oil.