Just a few things I’ve found that help!take a bunch of pictures (different angles) with a nice background, write a description noting any flaws or lack thereof, bundle series’ together in one listing, search on pango to price competitively, weigh books to get a more accurate/cheaper shipping price for the buyer, upload a profile pic (doesn’t have to be your face) and write a nice/friendly bio, also reuse packaging and make sure to communicate to buyers!
I’ve only been selling for a few months but have managed to make about $800, about half of that is from selling rare books, but the rest is from offering slight discounts for spending over a certain amount, something you can add in a setting on your shop page. it encourages people to buy multiple listings of yours even for books that have a million copies on pango