Save and Load Problem

I'm almost finished with my game. The only thing I have left to do is to securely save and load game states. I want to save a game through the pause menu, and load it back through the main menu, or the submenu titled Sweet Spot (sometimes after the user starts the game.). Here is my code so far.

SaveManager.cs:

 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using UnityEngine;
 
 public class SaveManager : MonoBehaviour
 {
     public static string directory = "SaveLoad";
     public static string fileName = "saveFile.sav";
     public static string gameFolder = "2D Indy";
     public static string saveDirectory = Application.persistentDataPath + "/" + gameFolder + "/" + directory;
     public static string savePath = saveDirectory + "/" + fileName;
 
     public static void Save(Player player)
     {
         if (!DirectoryExists())
             Directory.CreateDirectory(saveDirectory);
 
         using (BinaryWriter bw = new BinaryWriter(File.Open(Application.persistentDataPath + "/" + directory + "/" + fileName, FileMode.Create)))
         {
             PlayerData data = PlayerData.FromPlayer(player);
             bw.Write(data.Health);
             bw.Write(data.Lives);
             bw.Write(data.Score);
 
             if (data.Position == null)
             {
                 bw.Write(0);
             }
 
             bw.Write(data.Position.Length);
             foreach (var value in data.Position)
             {
                 bw.Write(value);
             }
             bw.Close();
         }
     }
 
     public static PlayerData Load()
     {
         try
         {
             using (BinaryReader br = new BinaryReader(File.Open(Application.persistentDataPath + "/" + directory + "/" + fileName, FileMode.Open)))
             {
 
                 PlayerData data = new PlayerData();
                 data.Health = br.ReadInt32();
                 data.Lives = br.ReadInt32();
                 data.Score = br.ReadInt32();
 
                 int length = br.ReadInt32();
                 data.Position = new float[length];
                 for (int index = 0; index < length; index++)
                 {
                     data.Position[index] = br.ReadSingle();
                 }
                 br.Close();
                 return data;
             }
         }
 
         catch
         {
             Debug.LogError("Save file not found in " + Application.persistentDataPath + "/" + directory + "/" + fileName);
             return null;
         }
     }
 
     private static bool SaveExists()
     {
         return File.Exists(GetFullPath());
     }
 
     private static bool DirectoryExists()
     {
         saveDirectory = Application.persistentDataPath + "/" + directory;
         return Directory.Exists(saveDirectory);
     }
 
     private static string GetFullPath()
     {
         savePath = saveDirectory + "/" + fileName;
         return savePath;
     }
 }

SweetSpot.cs:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SweetSpot : MonoBehaviour
 {
     public Player player;
     
     // Start is called before the first frame update
     void Start()
     {
         player = FindObjectOfType<Player>();
     }
 
     public void Load()
     {
         player.Load();
         Debug.Log("Your game has been loaded.");
     }
 }

PauseScreen.cs:

 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;
 
 public class PauseScreen : MonoBehaviour
 {
     public GameObject PauseCanvas;
     
     public static bool GameIsPaused;
 
     public PlayerController ball;
 
     public Player player;
 
     void Start()
     {
         GameIsPaused = false;
         ball = FindObjectOfType<PlayerController>();
         player = FindObjectOfType<Player>();
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetButtonDown("Cancel"))
         {
             if (GameIsPaused)
             {
                 Resume();
             }
             else
             {
                 Pause();
             }
         }
     }
 
     public void Resume()
     {
         Time.timeScale = 1;
         GameIsPaused = false;
         PauseCanvas.SetActive(false);
     }
 
     public void Pause()
     {
         Time.timeScale = 0;
         GameIsPaused = true;
         PauseCanvas.SetActive(true);
     }
 
     public void MainMenu()
     {
         Resume();
         SceneManager.LoadScene("MainMenu");
     }
 
     public void StartScreen()
     {
         Resume();
         SceneManager.LoadScene("Intro");
     }
 
     public void Save()
     {
         player.Save();
         Debug.Log("Your game has been saved.");
     }
 }

I can successfully save a game state to a file, but I'm unable to load it back from the file, especially from a different scene. Can anyone help with this? Any assistance would be appreciated. And also, please don't provide me with unsecured strategies such as PlayerPrefs or Binary Serialization. Thanks.

Sincerely, burchland2