How can I check if my webpage content is still relevant and optimized for search engines? Are there any reliable tools that analyze content quality, keywords, and SEO factors without being too complex?

You might want to try the content analysis tool at https://pr-cy.io/tools/content-analysis/. It's a useful on-page SEO checker that examines keyword placement, readability, and technical SEO elements. It's particularly helpful for identifying outdated content and suggesting improvements to boost your page's relevance.