How do online store sellers choose the right items for main promotion?

To promote Taobao/ Paipai online stores, the primary consideration should be which product to promote. In one of my previous blog posts, "How to Create Hot-selling Products for Taobao Stores," I mentioned that the current method for promoting online stores must adopt a "point-to-surface" approach. The main promoted item serves as the storefront window, and it significantly helps in boosting the overall popularity of the store.