A great way to build up speed and efficiency is to play a scale very slowly twice. And I mean Very slowly. Then play it twice at a medium/comfortable pace and then twice so fast that you begin to lose it. Then go back and do it slow once and medium once. It really works well. As far as becoming an incredible musician, I heard a quote from guitarist Pat Metheny once. He says he use to practice 10 hours a day everyday. And when you practice you have to push yourself into new areas you aren't familiar with, which is very frustrating at times.