I want to feel like a musician who is in full command of their instrument
To quote the old joke "If I were you, I wouldn't start from here"
I think you should accept that this is unrealistic. Even if you do manage a vast improvement, Impostor Syndrome may intervene to rob you of any sense of achievement. Eddie Van Halen suffers from extreme stage fright. Whatever your views of his music, he would certainly tick the box regarding your main statement
Lots of useless people believe they are great, lots of experts are plagued by self-doubt
If you can find a way of operating musically where you experience enjoyment while you're doing it, and are pleased about having done it, then that is a realistic target which is the key to satisfaction, in my view
To quote the old joke "If I were you, I wouldn't start from here"
I think you should accept that this is unrealistic. Even if you do manage a vast improvement, Impostor Syndrome may intervene to rob you of any sense of achievement. Eddie Van Halen suffers from extreme stage fright. Whatever your views of his music, he would certainly tick the box regarding your main statement
Lots of useless people believe they are great, lots of experts are plagued by self-doubt
If you can find a way of operating musically where you experience enjoyment while you're doing it, and are pleased about having done it, then that is a realistic target which is the key to satisfaction, in my view