var points = GameObject.FindGameObjectsWithTag("points");
moveSpots = points.Select(x => x.transform).ToArray();

void SetPosition (this Transform transform, float? x = null, float? y = null, float? z = null)
{
var position = transform.position;

position.x = x ?? position.x;
position.y = y ?? position.y;
position.z = z ?? position.z;

transform.position = position;
}

transform.SetPosition(y: 20);
или
transform.SetPosition(10, 20);