Cert for both www and plain domain

You should be able to do that using the command you originally used to obtain the certificate. Add --force-renewal to force the client to get a new certificate even if the current one isn’t close to expiring. Based on your earlier post, this would be something like:

./letsencrypt-auto --apache -d example.me -d www.example.me -d mysql.example.me --force-renewal

Revocation isn’t needed – that’s something you only need to bother with if your private key is compromised.