Independent rating is a sum of Patching Cadence, DNS Resilience, Network Security, Perimeter Security, Web App Security, SPAM Blacklist, and Mail Server Security metrics, which is obtained from 3rd party tools. 

The maximum achievable Independent Rating is 4.5.

Check your Independent rating at the Metrics tab.

You can increase this rating by improving each cybersecurity metric result.

Hover on each metric at the Metrics tab to see the ways of increasing the rating.