Where are all references to my domain name?

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Yes, I have set up URL rewriting to redirect all traffic to HTTPS. Here's my /etc/httpd/conf.d/dr0.conf:

<VirtualHost *:80>

    ServerName dr0.ch
    DocumentRoot "/var/www/html/main"

    RewriteEngine on
    RewriteCond %{SERVER_NAME} =dr0.ch
    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]

</VirtualHost>

However, I had that exact same configuration on my previous CentOS Stream 8 server and the renewal worked flawlessly for years. Also, certbot --apache works on this server, so I might theoretically run it every three months to renew the certificate by hand.