Exactly. When I set my bass up for the kind of playing I was truly interested in for my practicing and not worrying so much about performance, my playing took a huge leap forward. For me that meant solo strings, lower string height. My original concept was gut strings, high string height, percussive sound. But I also had a huge love of arco and full fingerboard, full range playing. As a younger player I hated sustain or “pretty” bass sounds. I moved to solos in the pandemic from the advice of Paul Kowert. Suddenly the Bach suites were within reach. But my Bluegrass/Oldtime friends kept calling me to busk in the park. I’d tweak my bridge accordingly in order to try to folkify my set up. But I noticed no one else seemed to care, in fact, I started to get more people saying “God that’s a gorgeous sounding bass” for literally the first time in my life. Slowly the two set ups became one and I never looked back. I think my previous set up and playing approach was choking the bass, killing sustain and resonance. Plus in the bargain I opened up the upper register with the bow which in turn led to vibrato study. Now I was really harnessing resonance I had only feared before. I was actively trying to “allow” the bass to do what it was capable of.
I listened to the video with good headphones last night. I think you sound really good. There are times when the bass really, if not growls, grunts pleasingly. I enjoyed the playing but I kept having a feeling that the note are being choked off, somehow not being allowed to fully bloom. I know that you are deadening on purpose at times, it's not that. But take those early faster passages, they seem to sort of stutter a bit. Could they be connected more, keeping the sound and the bass vibrating? Could you work a bit on connecting your passages? Slowing those figures down and connecting them as a piano might play them. I guess I'm speaking to making the bass sing more, though not necessarily looking for a bigger sound, just a more resonant singing sound. Do you work on double-stops? I was a super short note guy for a long time. It is very useful for early jazz, blues and oldtime. It gives is a drumlike thump. But at some point I realized that my short note style, even thinking I was mimicking Blanton or Ware, was a lack of perception on my part. Blanton was surely connecting his notes, I had only chosen to focus on the percussion part of the sound. By now you see Im going to be the "not bigger, more resonant" guy in the chat. You sound good, but I think you might be shorting yourself out of some deeper resonance.
I would go ahead and try some solos, get the string height dialed to your preferred tension, and slow down and try to work on long beautiful notes that connect to each other. Practice keeping the sound going through your line. Mess with your technique. Challenge yourself to tear what you've made apart to reveal something new. Take a look at vibrato, there are lessons in resonance in developing vibrato (the oft ignored left hand role in resonance). Stay open minded, challenge your own concepts and techniques to see if you can unlock something new. And see if you can get that bass to a place where it’s enjoyable to play. An easier bass set up was key to me finding loads of stuff I was denying myself in the self-martyrdom of playing this "hard" instrument.