Pick up a few intervallic techniques you can use when composing solos.
Learn a pentatonic scale workout that helps you get the five positions of the scale memorized and under your fingers.
Different triads you can use in order to outline maj7, 6, maj9 and maj7#11 chords, without having to learn anything beyond the basic triad shapes that you already know.
In this bite-sized lesson, Derek Trucks gives you some insights on incorporating natural and artificial harmonics into your slide lines.
In this classic GW lesson, Dimebag teaches you how to do "harmonic squeals," like the ones at the end of Pantera's "Cemetery Gates."
Some straightforward, essential practice techniques you can work into a simple, short daily routine to improve your dexterity, speed, strength and stamina.
Learn the different inversions of 4th chords on the middle four strings, and work on learning the chord scales associated with these chords.