Do not start with keywords. Start with the questions a shopper types or speaks when they are close to a shortlist: 'best X for Y,' 'X vs Y,' 'is X worth it,' 'X alternative,' 'does X work for [use case].' Build a list of twenty to forty prompts per product line, in the language customers use, not the language on your homepage. That list is the brief for every page, review, and comparison you will ship.
Pull the raw phrasing from site search, support tickets, Amazon or retailer Q&A, and the last fifty reviews that mention a competitor or a failed alternative. Cluster them into jobs: choose, compare, justify price, check fit, check safety or ingredients, find a substitute. One cluster becomes one page type. 'Best niacinamide serum for oily skin under $40' is a different page than 'how our niacinamide is made.' The first is citable as a shortlist. The second is a brand story that models skip unless a journalist already quoted it.
Run the same prompts in ChatGPT, Google (watching for an AI Overview), and one other assistant on the same day. Screenshot who is named, which URLs are cited, and what claim shape the answer uses — a table, a three-item list, a quoted review, a spec. You are not copying those answers. You are learning which evidence type the system already prefers for your category. If every overview cites a roundup and a Reddit thread, your missing asset is a roundup-shaped page plus independent discussion, not another feature list.