https://www.musical-u.com/learn/5-things-guitarists-dont-hold-back/
If there is one skill that guitarists should develop more than anything else, what would it be?
Rhythm? (great answer, but not correct).
Dexterity? (good, but not right)
Maybe theory? (agree to an extent).
But the one thing guitarists should truly focus on is something which no one will tell you.
Listening.
The single most important thing is to always be developing is your aural skills.
Discover the 5 Things Guitarists Don’t Do That Hold Them Back