Just saw this. I've been traveling a lot the past month. I'm not nearly as developed as DURRL or Sam, but maybe I can relate better because of it. I thought it sounded very good. If you listen to a lot of the recorded bass solos of the Masters, they typically, IMO, sound very similar.
After two listenings, I thought your ideas, rhythm, and intonation were remarkably good. The one concept that was brought up that I really agree with was variety. For this particular solo, I would have enjoyed more half and whole notes - space. You can also employ more *devices* - slurs, hammer-on-pull-offs, bends, triplet hammers, and odd-tempos - 5 against 4, etc. Thumb pos?
You could also briefly try playing outside of the harmony but quickly rein it back in. If you play outside too long, the audience just thinks you're off pitch, but doing it briefly adds a nice harmonic tension that lesser players tend to lack. The typically thing there is motif in harmony repeated a few times to motif out of harmony a few times to resolution back in harmony. Think Little Sunflower.
Hope that helps. Your soloing, I think, sounds pretty similar to mine, except that I'm starting to incorporate the suggestions I've made, which I've learned from the players I play with regularly who are more developed than me, so I hope it helps. The one thing that I've been stuggling with that you're not in this recording is playing in pitch during the solo, so my kudos to you. It's kind of a odd issue because I'm generally regarded by those I play with as having very good intonation and time, but sometimes when I solo, I briefly lose intonation. I get it back, but not before I ruin an otherwise very valid solo, at least from my POV.
If I'm off-base, please return to your normally internalized solo, listen to those more knowledgable than me, and forget I ever provided any suggestions.
I'd say, though, keep at it, you're sounding better than a lot of so-called pros, IMO.
It is kind of funny though. There's one bass player here in LA - same circles - that's just a little bit better than me, but he solos better than many pros I've heard. Wish I knew how he does it. I frequently have him sub for me when I can't make a gig. Depending on who you talk to, he's better than me or vice versa, but until recently anyway, everyone would say that he solo's better than I do. Hopefully, that's changing.