Hi @Chipie678, just as a reminder, as other people mentioned, revoking the certificates won’t affect the rate limit, so if you can’t get a certificate because too many have already been issued, you still won’t be able to do it after revoking an existing certificate.
You can find out the content of an existing certificate by running
openssl x509 -in cert.pem -text -noout
(which will show you, for example, who issued it, when it expires, and what domains it applies to - the subject alternative names), and you can see if a private key corresponds to the subject public key in an existing certificate by running
openssl rsa -in privkey.pem -pubout | openssl rsa -pubin -text
and seeing whether the modulus value that is printed there is the same as the modulus value printed by the
openssl x509 command.