Transferring Account Ownership to Other Licensed User

Hello group,

I had set up an account and purchased 4 additional licenses on behalf of a company for which I used to work. Before leaving I transferred ownership of all content to various licensed holders, but the main account is still linked to my name and old company email address. Does anyone know how to transfer the main account ownership to one of the other sub-license holders, without going through Smartsheet support (email)? I understand they're overwhelmed these days and would solve this myself if possible.

Many thanks in advance!