Move object in rotating direction.

I have an object that is being rotated constantly, I want to move that object towards that moving direction on a mouse click.

 void Update ()
     {
     
         if (stationary)
         {
             transform.rotation = Quaternion.Euler(0,0, Mathf.Sin(Time.time * 2) * 60); 
         }
 
         if (Input.GetMouseButtonDown(0)) 
         {
             stationary = false;
             myBody.velocity = new Vector2(transform.rotation.z , 10);
         }
     }

The code works, but the object always move up instead towards the direction it's facing, how to fix that?