Hey! I totally get where you're coming from—hitting a plateau can be really frustrating. When I was working on my finger dexterity, I found that mixing in musical phrases and scales made a big difference. Those repetitive chromatic level devil exercises can get stale, so try adding in some licks or solos you enjoy. Also, make sure you're keeping an eye on your posture to avoid tension; taking breaks to stretch your hands helps too! Have you thought about using a metronome to gradually work on your speed? Wishing you the best with your practice!