
Half price gives you next to nothing, I’d start with decreasing the prices or adding a sale or free shipping to your shop. Sales are better because they send a notification to people who have your books on their lists and add an icon that people can sort by. Free shipping takes too much from the seller if your books are cheap. You can also send offers directly to people who have your books in their cart
You could make new listings, when the listings are more recent they go to the top of search results and pango seems to promote your store more. Also adding a bunch of different angles in the pictures and a plant or something to make the photos look nice has always gone a long way for me. And make sure you add a profile pic, bio and change your store name from the default username if you haven’t. If they’re popular, being cheap and pretty listings should make them go fast
(Also I forgot you can add tags to the listings to make them appear when people search for specific things) If it still doesn’t work, I’d at least wait until after the holidays to take them elsewhere. People are more inclined to buy and the site will have more eyes on it as a whole. Good luck!