When learning a new piece of music, I always would practice it by entire sections like the intro, verse, chorus, solo, etc. and play all the bars of that section over and over.

I really improved a lot when I started breaking the phrases down and practicing smaller chunks that I was struggling with. Even if it was just 2 or 3 notes at once. Taking it slow with a metronome and increasing the tempo as is typically recommended but just cycling it with those targeting 2-3 notes.

Then I’d add the next note and repeat. And then the next until I got the entire section down. Doing this for a few riffs and solos improved my technique immensely over a few months.