An SEO website audit evaluates all the factors that can impact your site's performance in SERPs.
It's possible to conduct an SEO audit on your own but you'll likely get more thorough answers in less time by employing an agency. Consider working with an experienced Catchafire volunteer to assess the current state of your website and gain actionable steps to increase traffic.
There are free tools to grade/audit your website independently:
Website Grader - Check your Pages for Speed and SEO
Website Audit Tool - Automated Site Audit ⚙️ 120+ Checks