My power clean got stuck too so I just stopped doing for a while and decided to just build “brute strength.” I wasn’t specifically intending to up my power clean - just to build general strength. I started doing max effort good mornings, heavy front squats, and jump squats. I had previously never really done these exercises. After not having worked heavy cleans for several months (I’d do some light cleans for reps, but not heavy singles), I gained 10 kg on my clean.
MiketheBear is right about working hard on strength, but you need to also work on being more explosive…to be able to do the triple extension with the shrug as fast as possible. Some jumping drills would help too.
I would learn how to squat clean too. I think trying to max out on a power clean is a dead end. A full clean is just a clean that you weren’t able to pull high enough to power clean. It feels awesome to be able to squat clean a weight and quickly drive it out of the hole.
I don’t have much to add beyond the above replys and not seeing you do the lift makes giving advice a shot in the dark. Are you keeping your arms straight, elbows locked throughout the jump/pull until the last possible instant?
As the wise man said, ‘when the arms bend, the power ends’. Try loading up the bar even heavier and just practice the jump and shrug while focusing on keeping the elbows locked. Additional plyo work might help with the very critical explosiveness needed and sure never hurts anyway. Good luck…