The great cellist Pablo Casals was once interviewed by a young reporter. The interview was set in the morning and as the young man went to knock on the door of Casal's hotel room he heard the sound of the great man practicing. Once he was admitted, his first question to Casals was "Sir, you are in your 90's. Why do you continue to practice so hard?" The answer came "Well, I think I am making some progress."
That's great! I read an interview with with Ray Brown years ago. As the interviewer went to knock on Ray's hotel room door he heard, through the door, Ray practicing two octave scales on his bass in his hotel room. It's cool to know that even at that time in Ray's life (he was old(er)), Ray was dedicated enough to his craft to still be working on the basics and fundamentals of playing bass.
I keep that in mind while practicing, and still trying to master, basic fundamentals on electric. It never stops. Which is one of the great joys of playing an instrument.