I've been playing guitar and bass on and off for over 10 years but never had any formal training. I can play by ear pretty well and do some limited improvisation but I never learned a million cover songs, I didn't learn my scales, I know little to no theory. But, now that I've been able to play more this past year, I don't know how to spend my time playing. I'm finally learning the number system and trying to memorize the notes of each key and run through those over and over. I went back and replayed the 30 or so old covers I used to know from highschool. I feel like the best musicians I've been around are the players that know an insane number of covers, across several genres. Should I just sit down and grind out songs? Having said all that, I want to forget what I think I know about how to play and start from the beginning. What's the single best piece of advice for an aspiring musician/bassist?