Any Novels Where the Protagonist Sells Goods or Blind Boxes, Bringing Items from Other Worlds into the Current World?

Any recommendations for stories like these? Completed ones are fine too. Stories where the protagonist sells blind boxes or information. Stories where the protagonist brings content or objects from other worlds into the current world. Stories in the whole-world-awakening genre where the protagonist gets special attention because of an unusual talent or profession. Stories where the protagonist works behind the scenes in another world, changing how people think. Something similar to the books mentioned in the original post. Completed or ongoing is fine, but it should be at least 500,000 characters long. The more wildly off-topic the later suggestions are, the better.