Many students ask how to become better at soloing. My experience is the better a rhythm player a guitarist is, the better a soloist they will be. Scales and arpeggios taken by themselves cannot create the excitement for a good solo. Look at them more as a cataloging system and exercises to improve your manual and intuitive dexterity with the instrument. A solo that starts with a rhythm in mind (Funk or Blues, e.g.) will provide the solo with a framework to lay ideas over that will be shorter, more economical with less meandering and noodling, leading to tight call/response lines that tie the melody together in a colorful way.