How to make unity 2d repeating world in game Top Down?

Question

I am currently making a Top Down Shooter game and I need the card not to run out, I have 4 pieces of ready-made cards and I need them to appear randomly. I would like to use Object Pool. I can't handle it in any way. Please help me. There is a basic code. Help me finish the code pls.

private float _spawnRadius = 7;

[SerializeField] private Transform _pointTop;
[SerializeField] private Transform _pointRight;

[SerializeField] private GameObject _prefab;

void Update()
{
    Vector2 spawnPos = GameObject.FindWithTag("Player").transform.position;
    spawnPos += new Vector2(_pointRight.position.x, _pointTop.position.y) * _spawnRadius;

    Instantiate(_prefab, spawnPos, Quaternion.identity);
}`

I tried all the ways, but I can't do anything to create objects behind the camera, but it turns out that it is just being created on the spot. I hope my problem was clear to you!