No one can override the rate limit. It is imposed by the ACME Provider themselves. All that can be done is to change the ACME Provider to ZeroSSL in settings or use sslforfree website to generate one and manually install it.
You are accessing the account panel via the IP Address of a VPN Provider. VPN needs to be disabled.
The error code provided affirms the fact of a VPN or Corporate Network which is not allowed.
This is not a certificate being revoked. It means it expired.
You need to get a new one issued through hosting control panel Account Manager > SSL Certificates > Get automatic certificate from ACME Provider.
They are not disabled, but not using the wildcard option gets you a more quicker response without using the message center. Since the wildcard option takes longer due to it (I believe) using DNS to verify for it.
Towards first screenshot, from what I can read, that has been removed by Roundcube and uses Elastic theme now.
2nd one is because elastic theme doesn't support that so that has also been removed by Roundcube