Understand which plugins are no longer supported by Cloudflare.
Plugin support is discontinued for:
Cloudflare no longer provides software updates for these plugins and Cloudflare Support cannot assist to troubleshoot issues with these plugins.
If you have an already running instance of cPanel with the Cloudflare plugin installed and need to change the Host API key, this can be done simply by re-installing the cPanel plugin. Sites already configured will remain configured, but note that if those sites are not associated with your new API key, they cannot be managed after you change it.