How do i create a return function for my shooting mechanic?

Iam building a shooting mechanics that consists on: shoot a bouncing ball that travels only thru the x axis (2D Game) but I also want it to return back to the player on using the same same input.

this is my shooting script

public class orbWeapon : MonoBehaviour

{ public Transform firePoint; public GameObject ballPrefab; // Update is called once per frame void Update() { if (Input.GetButtonDown("Fire2")) { Shoot(); }
} void Shoot () { // shooting logic Instantiate(ballPrefab, firePoint.position, firePoint.rotation); }
} and this is my ball behaviour script

public class BallScript : MonoBehaviour

{ public Rigidbody2D rb; public float speed = 20f; Vector3 lastVelocity; // Start is called before the first frame update void Start() { rb.velocity = transform.right speed; } // Update is called once per frame void FixedUpdate() { lastVelocity = rb.velocity;

}
void onTriggerEnter2D (Collider2D hitInfo) { Debug.Log(hitInfo.name); } private void OnCollisionEnter2D(Collision2D coll) {
var speed = lastVelocity.magnitude; var direction = Vector3.Reflect(lastVelocity.normalized, coll.contacts[0].normal); rb.velocity = direction Mathf.Max(speed);
} }