I have been working in the SEO industry for over 11 years and recently sold my SEO agency. We found out that most of our time, especially the past 5 years, was spent fixing SEO work that was implemented by a previous SEO expert or agency. Now that I am not in the business of actually doing the SEO, I am shifting my focus on protecting businesses from outdated SEO practices including:

Auditing your current SEO vendor strategy

Verifying that campaigns are focused on the correct keywords

Monitoring monthly tasks and reporting

Evaluating trend of keyword ranking (Is it working?)

Sharing best practices with your SEO vendor