IP address is not secure and does not redirect to the domain name.

While this StackOverflow post suggests that it might be possible, this is not possible to achieve using CertBot/LetsEncrypt since it cannot generate an SSL certificate for "bare IP addresses":

• https://community.letsencrypt.org/t/ssl-on-a-ip-instead-of-domain/90635

That said, you might be able to create a server redirect within NGINX. Within the server block for your Fully Qualified Domain Name (FQDN), you could add another entry or alias so that your HTTP://$IPADRESS resolves to HTTPS://$FQDN_WEBSITE

• https://stackoverflow.com/questions/38060026/nginx-https-redirect-is-not-triggered-when-ip-address-is-used