To view suspended accounts within WHM, you can follow the steps listed below:
Log in to WHM and navigate to the List Accounts section:

Select the Suspended and press Apply Filter. The system will then display all accounts that are suspended:

This will allow you to view the date suspended, the suspension reason, and either unsuspend or terminate accounts:
For more information, see the following cPanel article:
https://docs.cpanel.net/whm/account-information/list-suspended-accounts/