How to stop autorenewal OR revoke a certificate

My domain is: writing.corp.networkingtechnology.org

My web server is (include version): Apache 2.4.37

The operating system my web server runs on is (include version):Alma 8.6

I can login to a root shell on my machine (yes or no, or I don't know):yes

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):1.22.0

The website writing.corp.networkingtechnology.org, no longer exists it ran on SMF 2.0.18 and I copied everything from it to a different phpBB forum with a new name and I have a certificate for that one as well which is fine

How can I either (a) Revoke this certificate or (b) simply stop it from auto-renewing?

Strictly speaking Let's Encrypt does mention "when they will no longer be using the certificate because they are discontinuing their website" as a valid reason, but usually this isn't necessary. Usually one would just delete the cert.

Delete the certificate from Certbot.

Apologies, I'm having problems with tabbed browsing and my comments seem to be overwriting each other.

Depending on the user, you want to run the command:

certbot delete

or

sudo certbot delete

That will present you with a listing of certificates to potentially delete, and you just select which one.