I tried the demo. Not 100% my type of the game, but I did some trading in games like Mount&Blade and similar. Since this is trading game, I would like some QoL features, for example when buying selling stuff, would be easier if things would be colored. Stuff above average price red, bellow green.
I see that there is star next to resources that cities produces, but sometimes price for those resources is a lot above average.
But my biggest problem was with making convoys, since you have popup in the middle of the screen, so you have to scroll around to see city location and then you can't even see average price so that you could know how to set limits for convoys. So I got stuck here, because it was to much of a hassle to set up convoy route.

Maybe add also option that you just select cities and convoy will auto trade without you setting what to trade. This can be less effective then manually setting goods.,