Save GameObject to file without Playerpref

Hi! So I am trying to save everything in my level and with the state they were. EX: If a door was broken, it stays broken. Door was unlocked, it stays unlocked. etc.
.

But All I can find currently find online are lacking a lot of informations and it is really frustrating.
.

I have done multiple test with just the player and I can't understand why it doesn't work and what is missing to make it work..
. I would like to be able to save everything on my player : All its components, all its children and all the childrens' children (including all their component). In a way, I would sort of think of having the similarity of a prefab of the player for lets say the "save A" or do what unity does when loading a level and remembering exactly where everything was and what were their components etc.
.

Here is a sample of what I tried so far :

 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using System.Runtime.Serialization.Formatters.Binary;
 using UnityEngine;
 
 public static class Load 
 {
     //Path of the saves
     static string SavesPath;
 
      public static GameObject LoadPlayer()
     {
         SavesPath = GameManager.Instance.GetSavesPath;
 
         if(File.Exists(SavesPath + "/save.json"))
         {
             try
             {
                 BinaryFormatter bf = new BinaryFormatter();
 
                 FileStream file = File.Open(SavesPath + "/save.json", FileMode.Open);
 
                 //Get the data
                 string data = (string)bf.Deserialize(file);
 
                 //Close the file
                 file.Close();
 
                 //Convert the Data into the an Object
                 SerializedGameObject player = JsonUtility.FromJson<SerializedGameObject>(data);
                 
                 Debug.Log(player.gameObject);
 
                 //Return the gameObject
                 return player.gameObject;
 
             }catch(System.Exception e)
             {
                 Debug.Log(e);
             }
         }
         return null;
     }
 }
 

 public static class Save
 {
     //Path of the save
     static string SavesPath;
 
 
     /// <summary>
     /// Save instance of the player
     /// </summary>
     public static void Player()
     {
 
         //Get the save path from the GameManager
         SavesPath = GameManager.Instance.GetSavesPath;
 
         //Look if the save folder exist
         CheckSaveFolder();
 
         //Look if the save file exists
         CheckSaveFile();
 
         try
         {
             //Get the gameobject of the player
             SerializedGameObject player = new SerializedGameObject();
             player.gameObject = PlayerManager.Instance.gameObject;
 
             //Stringify the GameObject
             string data = JsonUtility.ToJson(player);
 
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(SavesPath + "/save.json", FileMode.Open);
 
             bf.Serialize(file,data);
             file.Close();
 
             Debug.Log("Player saved successfully!");
         }catch(System.Exception e)
         {
             Debug.Log(e);
         }
     }
 }

 using UnityEngine;
 
 /// <summary>
 /// Allow to serialization of a GameObject
 /// </summary>
 
 [System.Serializable]
 public class SerializedGameObject 
 {
     public GameObject gameObject;
 }