So I'm about 16 years old, I've been playing bass since I was 12. I have grown a lot since then but i want to grow more in my styles of playing and genres, etc. so far I've been learning slap bass and it's coming along. But I know there's definitely a lot more I can do to become a better bassist. But I don't know what I should practice now. One of my goals is to learn to solo over any song in any key at any tempo, and I see all these professional bassists make it so effortless. They barely even touch the string! How can I get to that level and what should I be practicing?