void DrawCurrentTrajectory() {
    Vector2 position = transform.position;
    Vector2 direction = firePosition.position - transform.position;

    RaycastHit2D hit = Physics2D.Raycast(position, direction, maximumRayCastDistance);
    Debug.DrawLine(position, position + direction * maximumRayCastDistance, Color.red);

    if (hit) {
        Debug.DrawLine(position, hit.point, Color.green);
        Debug.DrawLine(hit.point, hit.point + hit.normal * 0.25f, Color.magenta);

        position = hit.point + hit.normal * 0.00001f;
    }
}

void DrawCurrentTrajectory() {
    Vector2 position = transform.position;
    Vector2 direction = firePosition.position - transform.position;

    for(int i = 0; i <= maximumReflectionCount; ++i) {
        RaycastHit2D hit = Physics2D.Raycast(position, direction, maximumRayCastDistance);

        if (hit) {
            Debug.DrawLine(position, hit.point, Color.green);
            Debug.DrawLine(hit.point, hit.point + hit.normal * 0.25f, Color.magenta);

            position = hit.point + hit.normal * 0.00001f;
            direction = Vector2.Reflect(direction, hit.normal);
        }
    }
}

public class RicochetTrajectory : MonoBehaviour
{
    public Transform firePosition;
    public int maximumReflectionCount = 5;
    public float maximumRayCastDistance = 50f;

    LineRenderer lineRenderer;

    List<Vector3> reflectionPositions = new List<Vector3>();

    private void Awake() {
        lineRenderer = GetComponent<LineRenderer>();
        lineRenderer.startWidth = 0.1f;
        lineRenderer.endWidth = 0.1f;
    }

    void Update()
    {
        DrawCurrentTrajectory();
    }

    void DrawCurrentTrajectory() {
        reflectionPositions.Clear();

        Vector2 position = transform.position;
        Vector2 direction = firePosition.position - transform.position;

        reflectionPositions.Add(position);

        for(int i = 0; i <= maximumReflectionCount; ++i) {
            RaycastHit2D hit = Physics2D.Raycast(position, direction, maximumRayCastDistance);
            if (hit) {
                position = hit.point + hit.normal * 0.00001f;
                direction = Vector2.Reflect(direction, hit.normal);

                reflectionPositions.Add(position);
            }
        }

        lineRenderer.positionCount = reflectionPositions.Count;
        lineRenderer.SetPositions(reflectionPositions.ToArray());
    }
}

position = hit.point + hit.normal * 0.00001f;