manage objects through a manager script

so, i am trying to manage different level triggers through a level managing script. what i am trying to figure out is how to turn on and off different cubes through the exiting of the level and loading the Hub world, enabling the next one.

this is what I have so far:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class LevelChecks : MonoBehaviour
 {
     public bool objectToDisable1 = false;
     public static LevelChecks control;
     
 
 
     public bool DesertLevel;
 
     void Awake()
     {
 
         if (control == null)
         {
 
             DontDestroyOnLoad(gameObject);
             control = this;
 
         }
         else if (control != this)
         {
 
             Destroy(gameObject);
 
         }
 
     }
 
 
 
    public void DesertLevelCheck()
     {
 
         if(objectToDisable1 == true)
         {
 
             GameObject.Find("Desert").SetActive (true);
 
         } else
         {
 
             GameObject.Find("Desert").SetActive(false);
 
         }
 
     }
 }

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityStandardAssets.Characters.FirstPerson;
 
 public class LevelChange : MonoBehaviour
 {
     public string sceneName;
     public LevelChecks LevelManager;
 
     void OnTriggerEnter(Collider c)
     {
         if (c.tag == "Player")
             UnityEngine.SceneManagement.SceneManager.LoadScene("Hub");
         
 
 
     }
 
     public void CharacterCameraRefresh()
     {
 
         GameObject.Find("FPSController").GetComponent<FirstPersonController>().enabled = false;
         GameObject.Find("FPSController").GetComponent<FirstPersonController>().enabled = true;
 
     }
 
 
 
 }