A website audit and repair should be included in an SEO package to address any SEO issues. Here are a few examples:
Optimization of metadata
Optimizing anchor text internally
Enhancing Alt tags
Adding, removing, or checking canonical tags
301 redirection implementation
Error 404 correction
Optimizing your sitemap
Correct other front-end issues flagged up in Search Consoles, such as slow loading times or mobile compatibility issues.