One of the best books I ever used to learn to develop and expand my guitar technique was Troy Stetina’s ‘Speed Mechanics for Guitar’.
He’s a monster guitar player but explained perfectly in the paragraphs amongst the exercises as to why we were doing the exercises and what benefit they had.
An entire section of the book was dedicated to the left hand whilst the other focused on the right. Amongst them were details on finger movement efficiency, dexterity and independence as well as a wide range of different movements that are idiomatic for the electric guitar.
The main idea that was re-enforced throughout the book was that speed is a pointless goal unless you aim for accuracy as well.
As I worked through the book along my metronome as a teenager, there were things gradually improving throughout the entire manner to which I played. I felt more in control, used the required amount of energy but nothing excessive and could play passages I thought were well beyond my ability.
These technical exercises played and still play a vital role in my journey for control on my instrument. Looking at the little details and the small steps you can take to level up is always something worth dedicating the time towards.