how do you make it homing type? like track down my target but it will just stop tracking once it passes by the target?

Question

    void Start()
{
    target = GameObject.FindGameObjectWithTag("Player").GetComponent<Transform>();
    Speed = Mathf.Lerp(speedScaling.x, speedScaling.y, Difficulty.GetDifficultyPercentage());
    visibleThreshold = -Camera.main.orthographicSize - transform.localScale.y;
}

// Update is called once per frame
void Update()
{
    FollowTarget();
    transform.Translate(Vector3.down * Speed * Time.deltaTime);

    if(transform.position.y < visibleThreshold)
    {
        Destroy(gameObject);
    }
}

void FollowTarget()
{
    transform.position = Vector2.MoveTowards(transform.position, target.position, Speed * Time.deltaTime);
}

I managed to make this projectile follow the target but not what i wanted to