Only practice makes perfect. Even virtuosos like Hendrix, Clapton or Vai couldn't avoid perseverance and had to acquire their skills step by step. Small practice sessions during the day often help.
Guitar 10-Minute Training Fretboard Hero is an excellent choice for improving the most important basic requirements. The book contains targeted playing exercises for each day and is suitable for both beginning and advanced players. Pentatonic, blues and rock scales, as well as scales are skillfully taught here in a daily 10-minute workout, as well as building stamina and endurance. This is possible in self-study as well as in guitar lessons and definitely achieves quick results that motivate.
All pieces are included on the enclosed CD.