If robots.txt disallows GPTBot, Google-Extended, PerplexityBot, ClaudeBot, or similar, those engines cannot crawl the page at all — this is the single highest-impact fix on the entire list, since everything else is irrelevant if the page can't be fetched.
Review robots.txt and remove any blanket Disallow rules targeting these user-agents, unless you deliberately want to opt out of AI training/crawling.
User-agent: GPTBot Allow: / User-agent: Google-Extended Allow: /