I can't get my list to loop and keep "spawning" prefabs

Hello I had a question earlier and a user named "RudyTheDev" was a great help starting me out. The script below I got from his answer and I modified it to position my prefabs that were already instantiated at run and act like they were spawning then scrolling across the screen.

I have been trying to get it to loop the positioning process so I could essentially make an endless runner, but once the "list" fills with "activatedobjects" I can't get it to restart the process. The second script below is how I though I was emptying the list and renewing the process but it doesn't work. If I could get some help or hints on how to restart the loop it would be much appreciated.

This is the modified script:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class EnableRandomChildren : MonoBehaviour 
 {
     public float spawnTime = 0.1f; 
     public GameObject[] spawnPoints = new GameObject[7];
     // Keep a timer since the last time we "spawned" a child
     private float timeSinceLastSpawn;
     private int i;
 
     void Start()
     {
         for(int i = 0; i < spawnPoints.Length; i++)
         {
             spawnPoints = GameObject.FindGameObjectsWithTag("Spawners");
         }
     }
 
     void Update()
     {
         // Tick down time until next spawn
         timeSinceLastSpawn += Time.deltaTime;
             // If the 2sec have passed for spawning
         if (timeSinceLastSpawn >= spawnTime)
         {
             // Schedule the next spawn in 2 sec
             timeSinceLastSpawn -= spawnTime;
             // Make a list of all children that are not yet enabled
             List<GameObject> availableObjects = new List<GameObject>();
             foreach (Transform child in transform)
             {
                 if (!child.gameObject.activeSelf)
                 {
                     availableObjects.Add(child.gameObject);
                 }
             }
             // If we found some
             if (availableObjects.Count > 0)
             {
                 // Choose a random child from the list
                 GameObject childToEnable = availableObjects[Random.Range(0, availableObjects.Count)];
                 // Enable the child
                 childToEnable.SetActive(true);
                  // .. and do other things to this child
                 childToEnable.transform.position = spawnPoints[Random.Range(0, spawnPoints.Length)].transform.position;
             }
         }
     }
 }

And this is the script I am using to try and renew the process or reset the list in the first script which is on each of the prefabs that are activated in the script above:

 using UnityEngine;
 using System.Collections;
 
 public class MoveObjectsInPool : MonoBehaviour {
 
     public float moveSpeed = 35.0f;
     public float prefabLife = 5.0f;
     private float timeToReturn = 0.0f;
 
     void Start()
     {
         timeToReturn = Time.time + prefabLife;
     }
 
     // Use this for initialization
     void FixedUpdate () 
     {
         float move = moveSpeed * Time.deltaTime;
         transform.Translate(-move, 0 , 0);
         CountDown();
     }
 
     void Deactivate()
     {
         this.transform.parent = GameObject.Find("ObjectPool").transform;
         gameObject.SetActive(false);
     }
 
     void CountDown()
     {
         if(timeToReturn < Time.time)
         {
             Deactivate();
         }
     }
 }