The key to generating sales on ecommerce marketplaces like Amazon, eBay, Etsy, etc. is to rank on internal searches. Let's say you are selling a T-shirt. If someone searches for t-shirts on Etsy, your listing should appear on the top. This will give exposure to your product, thus, helping you to generate sales. If your product is not found on searches, it will not be sold even if you have the best product. You need to use trending keywords for this purpose.