Turn on/off renderer for objects found with "FindGameObjectsWithTag"

Hello,
I’m trying to display a level of a game by enabling the mesh renderer for all the objects in the level once the player reaches a certain checkpoint and collides with it, but I can’t seem to make the code work:

if (collision.collider.name == "checkpoint1")
{
    GameObject.FindGameObjectsWithTag("level2").renderer.enabled = true;
}

The problem is .renderer property cannot be used with the GameObjects finder. Does anybody know a way to solve this or an alternative?
Thanks.

the problem is “FindGameObjectsWithTag” get a array of GameObjects back
u can use this

if (collision.collider.name == "checkpoint1")
        {
            GameObject[] objects = GameObject.FindGameObjectsWithTag("level12");
            foreach(GameObject obj in objects)
            {
                obj.GetComponent<Renderer>().enabled = true;
            }
        }