Rotate camera around object with camera follow

Hi! I have a cube that moves, i have a camera follow script that follows that cube. That is.

public class CameraFollow : MonoBehaviour { public Transform target;

 public float smoothSpeed = 0.125f;
 public float rotationAngleY = 90f;
 public float rotationSpeed = 10f;
 public Vector3 offset;
 private void FixedUpdate()
 {
     Vector3 desiredPosition = target.position + offset;
     transform.position = desiredPosition;
     Vector3 smoothedPosition = Vector3.Lerp(transform.position, desiredPosition, smoothSpeed);
     transform.position = smoothedPosition + offset;
 }

I need to rotate camera around this cube by pressing button on 90 degrees, i did that, but camera rotates around itself, not a target. But when i comment the cameraFollow part of script, it works correctly

 private float targetAngle = 0;
 const float rotationAmount = 1.5f;
 private void Update()
 {
     if (Input.GetKeyDown(KeyCode.Space))
     {
         targetAngle += 90.0f;
     }

     if (targetAngle != 0)
     {
         Rotate();
     }
 }

 private void Rotate()
 {
     if (targetAngle > 0)
     {
         transform.RotateAround(target.position, Vector3.up, -rotationAmount);
         targetAngle -= rotationAmount;
     }

 }

Will be pleausure for any help, stuck on this for a day.