How to get multiple lives

I have a game where every time the main character passes a goal at a certain time, it earns five extra lives along with five hundred points. Also, when the character reaches 100 points, it earns a single extra life. But I do not know how to program the first part. In fact, every time I finish a scene after I get the 500 points, when I destroy an enemy or obtain more points, I earn yet another extra life. Here is my script so far. The source of the problem is there somewhere.

GameStatus.cs: using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

 public class GameStatus : MonoBehaviour
 {
     public static int score = 0;
     public static int lives = 9;
     public int target = 100;
     public AudioSource myAudioSource;
     public AudioClip bell;
     public int bonusPoints = 500;
 
     // Start is called before the first frame update
     void Start()
     {
         myAudioSource = GetComponent<AudioSource>();
     }
 
     // Update is called once per frame
     void Update()
     {
 
     }
 
     void OnDestroy()
     {
         Debug.Log("GameStatus was destroyed.");
     }
 
     public void AddScore(int s)
     {
         score += s;
         if (score >= target)
         {
             AddLives();
             target += 100;
             myAudioSource.PlayOneShot(bell);
         }
     }
 
     public void AddLives()
     {
         lives++;
     }
 
     public void LoseLives()
     {
         lives--;
     }
 
     public void Bonus()
     {
                score += 500;
                if (score >= bonusPoints)
                {          
                           lives += 5;
                           target += 500;
                           myAudioSource.PlayOneShot(bell);
                }
     }
 }

PlayerController.cs:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;
 using System;
 using System.IO;
 
 public class PlayerController : MonoBehaviour
 {
     public Rigidbody2D myBod;
     public AudioSource myAudioSource;
     public int moveOnDelay = 4;
     public AudioClip crowd;
     public AudioClip cent;
     public AudioClip net;
     public AudioClip bell;
     public AudioClip splash;
     public AudioClip bat;
     public CountdownTimer ct;
     public Vector3 respawnPoint;
     private UnitManager gameUM;
     private HealthManager hm;
     public AudioClip takeSound;
     public int damageTaken = 1;
     public Transform firePoint;
     public GameObject ninjaStar;
     public GameStatus gs;
 
     // Start is called before the first frame update
     void Start()
     {
         myBod = GetComponent<Rigidbody2D>();
         ct = FindObjectOfType<CountdownTimer>();
         myAudioSource = GetComponent<AudioSource>();
         gameUM = FindObjectOfType<UnitManager>();
         hm = FindObjectOfType<HealthManager>();
         respawnPoint = transform.position;
         gs = FindObjectOfType<GameStatus>();
         if (GlobalControl.Instance.IsSceneBeingLoaded)
         {
             PlayerState.Instance.localPlayerData = GlobalControl.Instance.LocalCopyOfData;
 
             transform.position = new Vector3(
                             GlobalControl.Instance.LocalCopyOfData.PositionX,
                             GlobalControl.Instance.LocalCopyOfData.PositionY,
                             GlobalControl.Instance.LocalCopyOfData.PositionZ + 0.1f);
 
             GlobalControl.Instance.IsSceneBeingLoaded = false;
         }
         
         if (Input.GetKeyDown(KeyCode.Return))
         {
             Instantiate(ninjaStar, firePoint.position, firePoint.rotation);
         }
     }
 
     // Update is called once per frame
     void Update()
     {
         float x = Input.GetAxis("Horizontal");
         Vector2 origin = Vector2.zero;
         
         if (Input.GetButtonDown("Jump"))
         {
             myBod.velocity = new Vector2(x * 5, 7f);
         }
         else
         {
             myBod.velocity = new Vector2(x * 5, myBod.velocity.y);
         }
 
         if (Input.GetKeyDown(KeyCode.Return))
         {
             Instantiate(ninjaStar, firePoint.position, firePoint.rotation);
         }
     }
 
     void OnTriggerEnter2D(Collider2D other)
     {
         if (other.gameObject.tag == "coin")
         {
             int coinScore = 10;
             Destroy(other.gameObject);
             gs.AddScore(coinScore);
             myAudioSource.PlayOneShot(cent);
         }
 
         if (other.gameObject.tag == "obstacle" || other.gameObject.tag == "enemy")
         {
             HealthManager.HurtPlayer(damageTaken);
             myAudioSource.PlayOneShot(takeSound);
         }
 
         if (other.gameObject.tag == "FallDetector")
         {
             gameUM.LifeLost();
             myAudioSource.PlayOneShot(splash);
         }
 
         if (other.gameObject.tag == "bottle")
         {
             hm.FullHealth();
             myAudioSource.PlayOneShot(crowd);
         }
 
         if (other.gameObject.tag == "goal" && ct.countingTime <= 10f)
         {
             ct.myAudioSource.Stop();
             gs.Bonus();
             StartCoroutine("MoveToNextUnit");
         }
 
         if (other.gameObject.tag == "goal" && ct.countingTime > 10f)
         {
             int bonusScore = (int)(ct.countingTime) * 2;
             gs.AddScore(bonusScore);
             myAudioSource.PlayOneShot(net);
             StartCoroutine("MoveToNextUnit");
         }
 
         
     }

     public IEnumerator MoveToNextUnit()
     {
         yield return new WaitForSeconds(moveOnDelay);
         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
     }
 }

Any assistance would be appreciated.

Sincerely, burchland2