Ive been playing bass for more than 17 years now. I feel like I am way behind in my theory and my improvisation especially in regards to fills and groove. I mainly grew up listening and playing hard rock. Nothing fancy musically but taught me timing and energy. I learned a lot of funk and hip hop which helped with altering up my styles. So fast forward to today, now I'm playing in the band at a large church. I feel the area I am severely behind where I should be is the fills and general theory. I don't use chord sheets any more as i do it all by ear and memory. Sometimes I'll look at a chart if I get stuck or forget at rehearsal. But performance is memory only. I get tons of praise and compliments and I know I am talented and work hard on trying to play the best I can. I have my own little fills I do, but I tend to revert to the same style of just running up and down pentatonics or scales. When I try to recreate some fills on recordings it always intrigues me how they come up with such tasteful and musical ideas. I always try to remember them and use those in other areas, but it's like it just eludes me once I step away. So any tips or resources on what to practice? I watch a lot of SBL on YouTube which has been helpful but the more I can learn the better.