Why do my solos still suck!?

Hey, I am a intermediate/advanced guitar player and I feel like I have hit a wall in my playing; especially when it comes to soloing. Recently I have been learning this new solo to play with my band and it's decently fast and contains lots of bending. I feel like my technique is right and I took private lessons for years from a really great teacher who told me I was doing it right. I practice hours a day and I just feel like I am never going to get better at this. My fingers don't want to move quickly- it almost feels like they physically cant move faster. And the bends just sound gross and unsupported. Why are my hands not strong enough to play comfortably? How have I not gotten stronger after all these hours of playing FOR YEARS. Has anyone else felt like they plateaued like this?

Any playing tips, advice or antidotes is appreciated! Thanks.