To fix pages that are not indexed, begin by utilizing Google Search Console's URL Inspection tool to diagnose the exact reason for exclusion. Frequently, indexing issues stem from a noindex meta tag present on the page or directives within your robots.txt file blocking crawlers. Ensure your XML sitemap is correctly submitted and updated, as this helps search engines discover new and updated content efficiently. Furthermore, focus on optimizing content quality and uniqueness, making sure the page provides substantial value, and improve internal linking from other relevant pages on your site. Once technical hurdles are resolved and content is optimized, you can request re-indexing via Search Console, but be aware that the indexing process can still take some time.