How can I improve my vibrato guitar technique to add more expression and emotion to my playing?

To improve your vibrato guitar technique for more expression and emotion, practice by focusing on consistent speed and width of the vibrato, using your wrist and fingers to create a smooth and controlled motion. Experiment with different speeds and intensities to find what works best for the emotion you want to convey in your playing. Additionally, listen to and study recordings of Guitarists known for their expressive vibrato to learn from their techniques.