If you are looking to sell your KDP (Kindle Direct Publishing) interiors, there are a few places you can consider for maximum exposure and sales potential.
Amazon - You can sell your KDP interiors on Amazon itself, as this is the platform where you published them. You can list your book and make it available for sale in both print and digital formats.
Etsy - Etsy is a popular online marketplace for handmade, vintage, and craft items. While KDP interiors aren't necessarily handmade, you can still list them on Etsy as a digital product. This allows users to purchase your KDP interior and download it as a PDF file.
eBay - eBay is a well-known e-commerce platform where you can list your KDP interiors for sale. You can choose to sell them as a physical product (printed book) or a digital download as a PDF.
Your own website - If you have a website or a blog, you can market and sell your KDP interiors directly to your audience. You can set up a shopping cart to accept payments and offer a download link or mail the printed book.
Social media - You can use social media channels such as Twitter, LinkedIn, Instagram, Facebook and Pinterest to promote your KDP interiors. Share samples of your work, post a link to your online store, and promote any discounts, promotions or limited-time offers.
Remember to do research about each platform to ensure compliance with their terms of service before listing your KDP interiors. Additionally, it is important to price your interiors competitively, and market them effectively to maximize sales.