If you have root WHM access on your Cpanel server and SSH is not working for any reason even after you reset via WHM, you can load SSD with default config.

To do this, login to WHM as user root

https://host-name-here:2087/

Once logged in, go to following URL, this will start SSHD with default config on Port 22.

https://host-name-here:2087/scripts2/doautofixer?autofix=safesshrestart

If you have WHM security hash in url, the above url will be

https://host-name-here:2087/SECURITY-HASH-HERE/scripts2/doautofixer?autofix=safesshrestart