SHELL

certbot expand certificate

# List your certificates and copy all domains of the existing certificate
certbot certificates

# Run certbot will all domains + your new domain, sepereated by a ','
certbot --certname <certname> -d example.com,www.example.com,yournewdomain.example.com

# Now certbot will ask you, if you want to expand the cert, enter 'e'
# This also works, if you want to delete a domain from the list

use certbot to generate certificate

# certbot certonly --standalone -d myminio.com --staple-ocsp -m test@yourdomain.io --agree-tos