3rd Person Controller How to make the player face camera lookdirection [C#]

I want my player to rotate to the direction I'm looking at when I press W or S. I tried nearly all solutions I found at UnityAnswers and other websites. With the following code I made the player rotate but he didn't stop rotating after he was at the desired rotation:

 public float rotateSpeed = 4.0f;
 public GameObject Player;
 public GameObject Cam;
 
 if (controller.isGrounded && Input.GetKey(KeyCode.W)) {
             moveDirection = forward;
             moveDirection = transform.TransformDirection(moveDirection);
             moveDirection *= speed;
 
             float CamRot = Cam.transform.rotation.y;
             float desRot = CamRot * rotateSpeed;
             Quaternion target = Quaternion.Euler(0, desRot, 0);
             Player.transform.Rotate(0, desRot, 0, 0);
 
         }