Welcome to the deep and highly personal rabbit hole that is the subject of preamps.
The Sansamp is a great starter pedal, but to me it always sounds like you're playing a Sansamp regardless of what bass you're putting through it. I've experienced a similar phenomenon with the various Darkglass preamps I've tried... B3K, B7K, Vintage Ultra, Alpha Omega Ultra... always "the Darkglass sound." Great if you like those sounds of course, but not necessarily applicable to all styles/genres/personal tastes.
A good starting point may be something like the
The Great Preamp DI/Comparison. Many around Talkbass love it, as it's a not overwhelming parametric EQ (with other tricks) designed around the EQ strip from a Neve (if I remember correctly) recording console. I have one that's been on all my board builds for a few years, and actually borrowed some settings fr Adds some warmth and allows for great tone shaping, without adding nearly as much color to your sound.
Along with @moon-bass' preamp thread above, there's also these two threads in particular. Both are extensive, and
@scubaduba has put in an immense amount of work on the samples thread:
Tube Preamp/DI Sound Samples
The Great Preamp DI/Comparison
There are a few preamps on my list that I'd definitely like to try, but I think the top two at the moment are the Trickfish Minnow (not toobz) and the EBS Valve Drive DI (toobz).
The Trickfish was designed by Mike Pope and I really dig his onboard preamps. Jayme Lewis also has a great
demo/impressions video exploring the Minnow, with the bonus of info included from his recording engineer perspective. It's long, but it's 100% worthy of taking notes from, even if you don't have a Minnow. I borrowed some of his settings for my Qstrip.
I've wanted to try a Valvedrive for a good while, as both a tube preamp and seeming like a "poor man's Noble" in my head. I can't justify the $$$$ of a Noble as I don't do enough studio work, and the EBS has some additional bells and whistles that I like the idea of.
That said, my current "preamp" is a combination of a 10-Band EQ and Bergantino cab impulse block in my HX Stomp, with which I am currently extremely happy with for both live amp and IEM situations.

I've found it to be a killer combo for covering everything from 70's rock to modern pop.
Good luck with your search... Get a [
drink/snack of choice] and some good headphones or speakers, and settle in for some researching. It may take trying a preamp or two (or three... or four...) before you find one that you really vibe with.
5sg.