what are you meant to do once you're in this point where your market has been oversaturated on everything you can produce within it and you cant trade for shit that makes more profit?

all my buildings are working with a <1 gold profit because nobody needs to buy my shit.

i get that you need to just create jobs so you can tax your pops, and slowly increase trade so u can keep bringing in shit that makes the big bucks but beside that am i missing something