that depends on how you set up your project,
You can use for example a bool switch or if you have more than 2 player you can use an int switch.
lets say you start with player 1, when that player is done set a int variable (for example 'current player') to "2" then loop back to the int switch, it will detect 2 and will go to the state for player 2
Another possibility is to use arrays, use the int variable for the index nr, but player one should be 0, player 2 should be 1 and so on (arrays start @ index 0)
(for example) have one array for you 'player' gameobject and one for current positions, one for certain buffs or debufs, and so on...
A big advantage by using arrays is that you need a lot less states to do things.
if you would need 4 states per player...in the 1st method you will need 17 states
in the 2nds method 4 or 5.
There are some tutorials for arrays on the user tutorial wiki page