Watch the Playing In Position: Major online guitar lesson by Robbie Calvo from Power Play: Major
The major keys of A-C-E-G are what you'll be playing over. Each key as you know is 8 bars long. The idea is to improvise a solo in each key, in position on the fretboard. Playing in postion is going to limit you to exploring ideas within the scale shapes that lie in that location. This strengthens your knowledge of those shapes and how they relate to the following key change. Try to structure your improvisations. By this I mean build your solo from start to finish in a musical way. Perhaps playing four measures as simple melodic motifs using 8th notes. Add triplets and 16ths in the last 4 measures to increase the pace and build to a crescendo. Once one full sequence is complete shift into the next available scale shape position up the fretboard and play through the sequence of key changes in that position, improvising using the major scale shapes at that fretboard location. It's a great challenge and will sharpen your chops tenfold.