Diagnose why a ranking page is decaying

This page has lost rankings: {{URL}}. Its target keyword is "{{keyword}}". Traffic went from {{before}} to {{after}} between {{dates}}.

Work through the hypotheses in order of likelihood and tell me the evidence that would confirm or kill each:
1. SERP intent shifted — compare what ranks now versus the page's assumption.
2. Competitors published something materially better — name which and what they added.
3. The page is stale in a way that matters (dates, prices, product names, dead screenshots).
4. Cannibalisation from our own newer pages.
5. Technical: indexation, internal links lost, Core Web Vitals, redirect chains.
6. Site-wide or algorithmic, not page-specific.

Then give the refresh plan: what to rewrite, what to add, what to delete, what to merge, and what to leave alone. Rank the actions by expected recovery per hour of work. Say explicitly if this page should be consolidated into another instead of refreshed.