If you dont want nothing major, I would definetly tell you to go practice the Dorian mode. It is the easiest way to MONSTERLY improve your blues improvisation skills. After that I would recommend mixolidian, which would make you go to the next level on blues improvisiation, but it has a major flavor to it. Now, if what you want is get better at everything regarding solos construction and improvisation in western music I would recomend: 1- minor penta 2- Major penta 3- Major scale 4- 7 Dominant arpejios 5- 7maj arpejios 6- 7 minor arpejios 7- Modes (in this order: Dorian, eolian, mixolidian, ,lidian, phrigian, locrian[this one is pretty useless, for the most part]) It is a damn tough road to learn all this, but in the end. oh boy, you will be free from your chains.