Service Desk Manager

Answer:
Service Desk is related to many activities in scope of the organizations' ITSM (see the article about SD types: "ITIL Service Desk types" https://advisera.com/20000academy/blog/2014/05/06/itil-service-desk-types/).
Therefore, you as a Service Manager have to consider services, people involved in SD activities, customers/users, internal organization, processes, tools in use, etc. So, as you can see, many (sometimes different) areas have influence on your activities. You can find more details in following articles:
"Service Desk: Single point of contact" https://advisera.com/20000academy/knowledgebase/service-desk-single-point-contact/
"What is the job of the Service Desk Manager?" https://advisera.com/20000academy/blog/2016/09/20/what-is-the-job-of-the-service-desk-manager/ e-job-of-the-service-desk-manager/
"Service Desk staff – a window to the IT organization" https://advisera.com/20000academy/blog/2014/02/18/service-desk-staff-window-organization/