How to improve playing form?? (Strap length, muscle relaxation, etc.)

Hi, I gradually developed my own style & playing form after moving on from basic stuff, I started mainly just using fingerstyle for years before switching to using a pick, playing more aggressively, lowering my strap because I like having more room (so my elbow doesn't always have to be super bent).

I know I generally use proper form, but I'm feeling a little awkward since switching to some new styles of music, and also trying fingerstyle again. I'm wondering what the best form is for playing while STANDING and using fingerstyle. I've seen so many videos of people with their straps so short their bass is just sitting on their chest, but for some reason, it feels awkward for me. I want to be able to move & just can't figure out what feels most comfortable for some reason.