Every major search update produces the same two stories. Some affiliate sites lose most of their traffic overnight. Others barely notice. Having operated properties through many of these cycles, I no longer think of this as luck. The survivors share a set of structural decisions made long before the update arrived.
The page helps someone decide
A comparison or review page earns its keep by making a purchase decision easier. That means real criteria, honest trade-offs and clear recommendations for different situations, not a list of products with the same three adjectives. Search engines have become effective at recognising when a page adds nothing beyond the retailer's own listing, and those pages are the first to go.
Informational content carries the commercial pages
Sites built entirely of money pages are fragile. Sites where buying guides sit inside a wider body of genuinely useful informational content are far more resilient, because the informational pages establish the site as a resource on the topic and pass that credibility to the pages that convert. This is the topical-map principle applied to affiliate economics.
Trust is visible on the page
Who wrote this, why should I believe them, and how are they paid? Sites that answer those questions plainly, with named authors, clear disclosures and evidence of first-hand experience, hold up better than anonymous ones. This is not decoration; it is what quality raters and ranking systems are instructed to look for.
Revenue is diversified
A property that depends on one affiliate program and one traffic source has two single points of failure. The properties I keep long-term earn from a mix: multiple programs, display advertising where appropriate, sometimes a tool or product of their own, and audiences that arrive through more than one channel.
The site is technically sound
Fast pages, clean structure, working internal links and no broken or redirecting money links sound basic, and they are. They are also routinely neglected on affiliate sites that were built quickly for a trend. Basics are what remain when a trend ends.
Build the site you would want to find if you were the one about to spend the money. That rule has outlasted every update.