Keywdord research
Analyze SERPs while auditing keywords/traffic while discovering LSI and backlink opportunities.
Advanced SEO
For the seasoned website, below the fold 1st page strategies that can boost traffic.
On-Page
Evaluate On-Page elements for development.
The most advantageous market conditions
Backlinks
Any miscellaneous items that may show up... depends on what industry your are in, your current situation, and what your competitors are up to (Local SEO, Schema markup, Backlinking, etc.).
Technical
Check site for overall technical errors to identify exceptions and take corrective actions.
Google Web Vitals
Run a test audit to check website performance and enhance user experience.