How do I make a laser that bounces around a room?

Hi there, I am working on my first project of 2021 and have run into a little issue. I am trying to make a "laser pinball" sort of 2D game in which a laser is shot from a turret at an angle chosen by the user (they aim and shoot it), the beam then bounces around the room, interacting with various obsticales throughout whilst attempting to hit a goal located somewhere in the room.

I have attempted to script the laser via tutorials and personal knowledge... but I can't quite figure it out! I think all the pieces are here..

So far the laser shoots and stops once it hits a wall (polygon collider 2D). At this point I am unable to figure out how to script the laser reflecting off of the walls.

Here's my script: (c#)

 public class Laser : MonoBehaviour
 {
     
     [SerializeField] private float defDistanceRay = 100;
     public Transform laserFirePoint;
     public LineRenderer m_lineRenderer;
     public Transform CrosshairPos;//
     public Transform m_transform;
     private Vector3 laserDir;//
 
 
     private void Awake()
     {
         laserDir = new Vector3();
         m_transform = GetComponent<Transform>();
     }
 
     private void Update()
     {
         ShootLaser();
     }
     
     void ShootLaser()
     {
         laserDir = (CrosshairPos.position - m_transform.position).normalized;//
 
         if (Physics2D.Raycast(m_transform.position, laserDir))
         {
             RaycastHit2D _hit = Physics2D.Raycast(m_transform.position, laserDir);
             Draw2DRay(laserFirePoint.position, _hit.point);
         }
         else
         {
             Draw2DRay(laserFirePoint.position, laserDir * defDistanceRay);
         }
                
     }
 
     void Draw2DRay(Vector3 startPos, Vector3 endPos)
     {
         m_lineRenderer.SetPosition(0, startPos);
         m_lineRenderer.SetPosition(1, endPos);
     }
 }
 

Any help is much appreciated!