Enum-Based State Machine Modeling

In my state machine, I have a state that has sub-states. Whenever the sub states's are done, I would like to go back to the initial state.

In order to achieve this I store the Previous State inside those sub-states:

enum AppState {
 case StateA
 case StateB
 indirect case StateC-1(previousState: AppState)
 indirect case StateC-2(previousState: AppState)
 indirect case StateC-3(previousState: AppState)
}

This is pretty cumbersome and feels incorrect. Can anyone suggest a better design for this?

Thank you