Kill Quest Issue

Hi guys I am trying to make Kill quest system for my game but unfortunately I cant manage to pass this point I am following this tutorial but still doesnt work. https://www.youtube.com/watch?v=LONrh-6xbXQ

Here are the scripts

[System.Serializable] public class Quest { public bool isActive; public List Goals = new List(); public string title; public string description; public int experienceReward; public int goldReward; //public Item ItemReward {get; set;} public bool Completed { get; set; }

 public void CheckGoals()
 {
     Completed = Goals.All(g => g.Completed);
     if (Completed) GiveReward();
 }
 public void Complete()
 {
     isActive = false;
     Debug.Log(title + "was completed");
 }
  
 void GiveReward()
 {
     // give reward
     Debug.Log("Reward given");
 }

}

[System.Serializable] public class Goal { public string Description; public bool Completed; public int CurrentAmount; public int RequiredAmount;

 public virtual void Init()
 {
     //default
     Debug.Log("init works");
 }

 public void Evaluate()
 {
     if(CurrentAmount >= RequiredAmount)
     {
         Complete();
         Debug.Log("quest completed");
     }
 }

 public void Complete()
 {
     Completed = true;
 }

}

public class KillGoal : Goal { public int EnemyID; public int QuestAmount; public KillGoal(int enemyID, string description, bool completed, int currentAmount, int requiredAmount) { this.EnemyID = enemyID; this.Description = description; this.Completed = completed; this.CurrentAmount = currentAmount; this.RequiredAmount = requiredAmount; }

 public override void Init()
 {
     base.Init();
     CombatEvents.OnEnemyDeath += this.EnemyDied;
     Debug.Log("initiliasing");
     
    
 }

 void EnemyDied(IEnemy enemy)
 {
     if(enemy.ID == EnemyID)
     {
         this.CurrentAmount++;
         Evaluate();
         Debug.Log("enemyDied ++");
     }
 }

}

public class CombatEvents : MonoBehaviour { public delegate void EnemyEventHandler(IEnemy enemy); public static event EnemyEventHandler OnEnemyDeath;

 public static void EnemyDied(IEnemy enemy)
 {
     if(OnEnemyDeath != null)
     {
      OnEnemyDeath(enemy);
         
     }
     
 }
 

}

public class EnemyHealth : MonoBehaviour ,IEnemy { public int enemyHealth; public int currentHealth; public int speed; public delegate void onEnemyDeath(); public static event onEnemyDeath enemyDeath;

 public int ID { get; set; }
                               // public int enemyQScore = 1;
 public LayerMask Ground;
 private Animator anim;
 public GameObject bloodEffect;

// public GameObject bloodSplash; public int scoreValue = 1; public GameAssets Player;

 void Start()
 {
    ID = 1;
     
     anim = GetComponent<Animator>();
     currentHealth = enemyHealth;
   
 }

 void Update()
 {
    
     if (enemyHealth <= 0)
     {
         //Instantiate(bloodSplash, transform.position, Quaternion.identity);
         Instantiate(bloodEffect, transform.position, Quaternion.identity);
         UpdateQuestScore();
         Destroy(gameObject);
         SoundManager.PlaySound(SoundManager.Sound.EnemyDie);
        
         
     }
     {
         transform.Translate(Vector2.left * speed * Time.deltaTime);
     }


 }
 public void TakeDamage(int damage)
 {
     
     Instantiate(bloodEffect, transform.position, Quaternion.identity);
     enemyHealth -= damage;
    // Debug.Log("damage TAKEN !");
 }
 public void OnDestroy()
 {
    
     ScoreManager.score += scoreValue;
     
     
 }
 public void UpdateQuestScore()
 {
     if (enemyDeath != null)
     {
         enemyDeath();
         Debug.Log("updateQS");
     }
 }
 
 
 

}

Will appreciate any help or advice. I cant update the score after my enemy dies to the quest so i can reach the required amount and finish the quest.