What are you missing that your current set up isn’t offering? What other preamps have you tried and what was it about them that didn’t work or do you want to mix it up. The Zoom is handy but do you want a stand alone, single pre unit with tubes and transformers and no need for presets?
I ask because I have been using a preamp set up (into a cab ir) direct to doh and I’m very pleased with it. It’s a tube based unit and has a nice character which I feel gives some extra dimension in the mix and it feels responsive under the fingers, no latency etc. That little bit of grit I can get from it blends into things nicely in the mix and doesn’t sound sterile going direct (and that was before the cab ir was on my board).
There’s tons of pre amps out there. It all depends what’s important - latest chipset, one good solid core tone, presets…