Sometimes when you block yourself via a firewall, and it's permanent, there's a few things you can try if you are not right there at the machine to login directly.
> You can call your DC or provider and have them login to remove your IP from the ban list by logging in via shell right at the machine.
> If you have more than one server you can always add the other server's IP to your firewall "whitelist", which would allow you to login from that other box to fix your IP ban.
> You might also try using a proxy to access WHM to try and remove your ban, but unless you pay for a proxy service most will block abnormal ports like 2086/7.
> Use a key based logins so you will never have to enter a password again.
> Or if your SSH client allows login scripts, create one so you don't duplicate this later. The last one is not recommended, as it encourages you to not change your pw periodically.
Hope those help.