Redirect Domain in Cloudflare
Source: Redirect example.com to www.example.com
1. Set up A records in Cloudflare
Point new A records for @ and www to 192.0.2.1. This is a dummy address but allows page rules to work on Cloudflare.
2. Set up page rules in Cloudflare
Now set up page rules to forward both domain.com and <www.domain.com> to the new URL