Learning to play beautiful musical guitar solos is a lifelong process for every guitar player. You can practice many techniques and exercises, but they are not of any use if you can't figure out how to apply them in a musical way.
In my solo guitar lessons, I always to use the String Fragment System, instead of box shapes for scales. That's because SFS helps you play more musically. It builds a better fingers-to-sound connection. It helps you play creatively, and jump freely around the guitar fretboard, which is far superior to being stuck in a box shape and trying to make music with it!
But in addition to the the flexibility of SFS, we need some way to deliberately insert new improvisation elements, and build a personal soloing language that sounds musical. So watch this lesson and learn ways to turn your knowledge into music: