Think outside the box, play solos using these scales over an E chord or E note, to give a lot more variety in your playing by changing the home (root) note, your fingering, your string bending, and your riffs. You don't have to learn new scales, just play the the ones you know over different chords:
- play a Dorian minor scale in C#, which are all major scale notes in E
- play a minor pentatonic scale in F#, which are all major scale notes in E, uses a 4th (A) instead of a major 3rd (G#)
- play a minor pentatonic in B, same as a E pentatonic but it substitutes an F# for the G, for a softer sounding scale, part way between major & minor
- play a Dorian minor scale in B (same as above but with 2 added notes)
- play a natural minor scale in A, which are all minor scale notes in E
- play a Dorian minor scale in G#, which are all major scale notes (do re mi...), except that the 4th (A) is replaced with an A#, for an exotic Indian sound
- play a natural minor scale in D, for a middle eastern sound. It's an E natural minor scale, but with the F# replaced by an F for added tension & dissonance
So many players get in a rut with their solos. Mix it up and intersperse these with the scales you normally use, in the same solo. Find which of these work with various songs. Experiment.