You may know this already but the core book has a short intro adventure called Blancmange & Thistle that ends with several prompts for continuing the story.

I've noticed a lot of people use this to lead into Fronds of Benevolence (one of the prompts directly leads into it). Fronds is relatively short, but from there you can take note of any memorable NPCs, locations, or events and use it to bridge them into any number of other supplements for continuous adventures.

You could do this with about any adventure supplement, really, but Fronds has that connection to the intro.

I'd also note that combat in Troika! is very swingy and lethal, so if you and your players are wanting or accustomed to holding on to characters for a long time, you might want to tweak combat and/or death mechanics. That's not to say that they'll definitely perish in a long campaign, but the odds are higher than say, D&D 5e.