How to update my LetsEncrypt certificate (for a different email)?

My LetsEncrypt certificate is expiring soon and I’m trying to renew it for my Rancher Cluster (hosted on an EKS cluster).

I’ve changed the because the previous owner of this cluster isn’t working with us anymore. So, I tried steps 3, 4, and 5 of the official documentation but my certificate it’s still the same:

Updating the Rancher Certificate | Rancher Manager](Updating the Rancher Certificate | Rancher Manager

I’m curious if I need to generate a LetsEncrypt certificate manually again (using certbot) and update the secret with it or how can I run a certbot server if my rancher application is running on a k8s cluster?