I want to know how to save high score.

I've made a Brock break game before (it can be said that "long ago..."), and I wanted to save high score in the game and if next player breaks the high score it will be saved until next player breaks the high score, but in my game, the programming isn't working and high score of the game isn't saved. Can someone please tell me how can I solve?

This is my score programming from websites that teaches me a breakout game. using UnityEngine; using UnityEngine.UI;

 public class Score : MonoBehaviour
 {
 
     
     public Text scoreText;
     
     public Text highScoreText;
 
     
     private int score;
 
     
     private int highScore;
 
     
     private string highScoreKey = "highScore";
 
     void Start()
     {
         Initialize();
     }
 
     void Update()
     {
         
         if (highScore < score)
         {
             highScore = score;
         }
 
         
         scoreText.text = score.ToString();
         highScoreText.text = highScore.ToString();
     }
 
     
     private void Initialize()
     {
         
         score = 0;
 
         
         highScore = PlayerPrefs.GetInt(highScoreKey, 0);
     }
 
     
     public void AddPoint(int point)
     {
         score = score + point;
     }
 
     
     public void Save()
     {
         
         PlayerPrefs.SetInt(highScoreKey, highScore);
         PlayerPrefs.Save();
 
         
         Initialize();
     }
 }

and this is the code for adding point

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Destroyer : MonoBehaviour
 {
 
     public GameObject masterObj;
 
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         
     }
 
     private void OnCollisionEnter(Collision collision){
         masterObj.GetComponent<GameMaster>().boxNum--;
         FindObjectOfType<Score>().AddPoint(10);
         Destroy(gameObject);
     }
 }