Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
There's one problem: If Nginx is configured to use certificate files that don't exist, it will be unable to reload or restart, which will also prevent you from using "certbot --nginx" to issue new certificates.
So, first, make sure Nginx isn't using the old certificate. Then you can delete it.
Alternatively, you can replace the old certificate with the new one, using: