Performing a comprehensive SEO audit involves analyzing various aspects of a website to identify areas that need improvement. Here are the steps to do an SEO audit in-depth:

1. Conduct a comprehensive site audit: This involves analyzing the technical SEO aspects of a website such as page speed, site architecture, sitemap, mobile responsiveness, and site security. You can use tools like Google Search Console, SEMrush, or Ahrefs to perform a technical site audit.
2. Analyze the site structure: This involves analyzing the structure of the website, including the URL structure, navigation menu, and internal linking. You should ensure that the site structure is user-friendly and makes it easy for users to find the content they are looking for.
3. Analyze the website content: This involves analyzing the website content to ensure that it is high-quality, engaging, and relevant to the target audience. You should also check for duplicate content and ensure that the content is optimized for relevant keywords.
4. Conduct a backlink analysis: This involves analyzing the website’s backlink profile to ensure that it is high-quality, diverse, and relevant to the website’s niche. You can use tools like Ahrefs, Moz, or Majestic to perform a backlink analysis.
5. Analyze website analytics: This involves analyzing website analytics to understand user behavior, including bounce rates, time on site, and conversion rates. You should also analyze keyword performance, organic traffic, and referral sources to identify areas that need improvement.
6. Conduct a competitor analysis: This involves analyzing the websites of competitors to understand their SEO strategies, including keyword targeting, content strategy, and backlink profiles. This information can help you identify areas where you can improve your own SEO strategy.
7. Develop an SEO strategy: Based on the insights gathered from the audit, develop an SEO strategy that includes both on-page and off-page optimization tactics to improve the website’s visibility and search engine rankings.

Overall, conducting an in-depth SEO audit is an essential step in improving a website’s search engine rankings and attracting more traffic to the site.