Camera isn't move position? Why my camera isn't change position?

I have a question, i make a parkour game and my hero must run on the top but I must move camer down, but it isn't. Can someone help me?

 Quaternion targetAngle_180 = Quaternion.Euler(0, 0, 180);
 Quaternion targetAngle_0 = Quaternion.Euler(0, 0, 0);
 public Quaternion currentAngle;

 public GameObject player;
 public bool isGr;
 public GameObject cam;
 public bool isDone = true;

 public Rigidbody Rigid;


 void Start()
 {
     currentAngle = targetAngle_0;
 }

 public void Update()
 {
     if (isGr == true)
     {
         ChangeCurrentAngle180();
         
         if(isDone == true)
         {
             cam.transform.position = new Vector3(0, 100, 0);
             isDone = false;
         }
     }

     if (isGr == false)
     {
         ChangeCurrentAngle0();
     }


     player.transform.rotation = Quaternion.Slerp(player.transform.rotation, currentAngle, 0.2f);
 }

 void ChangeCurrentAngle180()
 {
     if(currentAngle.eulerAngles.z == targetAngle_0.eulerAngles.z)
     {
         currentAngle = targetAngle_180;
     }
     
 }

 void ChangeCurrentAngle0()
 {
     if (currentAngle.eulerAngles.z == targetAngle_180.eulerAngles.z)
     {
         currentAngle = targetAngle_180;
     }
 }


 void OnTriggerEnter(Collider other)
 {
     if (other.gameObject.CompareTag("Player"))
         Rigid.mass = 4; // This can be changed to whatever you want, this is if you want the mass changed;
     Rigid.useGravity = false; // This is if you want to turn the gravity off;
     isGr = true;
 }


 void OnTriggerExit(Collider other)
 {
     Rigid.mass = 1; // Back to normal here using mass;
     Rigid.useGravity = true; // This is if you want the gravity to be turned back on;
     isGr = false;
 }

}