Each world the game is thriving if there is a strong market and struggling when there is none. I understand concept that we need to create everything by ourselves, but sometimes a push is required. If you create visitor gated palisade, charter stone and some boxes from the start - this will add a lot of interactions and involvement. And later in the game it will still be a reliable way to connect people.
Make it a monument to some great markets there were

I understand that there might be some corner cases with it that I am not getting, but also It seems that it might not be that hard to implement.
How far you want to go from that point depends on your vision, but it opens a lot of possibilities: start everyone around this initial market, introduce some amount of NPC trading, throw in some events.
P.S. I am sure that someone already suggesting the thing. But I wasnt able to find it within 10 minutes flipping through this forum. And I am considering this very big thing which is worth revisiting from time to time.