public AnimationCurve rotationCurve;

    public float targetSpeed;
    public float speedlerp;

    float currentSpeed;
    float curvePosition;

    public bool isRotating;

    void Update()
    {
        if(isRotating)
        {
            currentSpeed = Mathf.Lerp(currentSpeed, targetSpeed, speedlerp * Time.deltaTime);
        }
        else
        {
            currentSpeed = Mathf.Lerp(currentSpeed, 0, speedlerp * Time.deltaTime);
        }
        curvePosition += Time.deltaTime;

        float curveMultiplier = rotationCurve.Evaluate(curvePosition);

        float finalSpeed = currentSpeed * curveMultiplier;

        transform.Rotate(Vector3.right, finalSpeed * Time.deltaTime, Space.Self);
    }