Hello everyone i am new to unity and i want to make a script that chooses a person to follow

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Enemy : MonoBehaviour
 {
     [SerializeField] GameObject Player;
     [SerializeField] GameObject[] enemies;
     GameObject currentEnemy;
     int index;
     // Start is called before the first frame update
     void Start()
     {
         enemies = GameObject.FindGameObjectsWithTag("enemy");
         index = Random.Range(0, enemies.Length);
         currentEnemy = enemies[index];
        
     }
     private void Update()
     {
        
       transform.position=  Vector3.MoveTowards(transform.position, currentEnemy.transform.position, 6*Time.deltaTime);
     }
     private void FixedUpdate()
     {
         StartCoroutine(ChangeLocation());
     }
 
     // Update is called once per frame
     private void OnTriggerEnter(Collider other)
     {
         if (other.gameObject.tag == "Bullet")
         {
             Destroy(gameObject);
             Debug.Log("Destroyed");
 
         }
     }
 
 
     IEnumerator ChangeLocation()
     {
         yield return new WaitForSecondsRealtime(10);
         enemies = GameObject.FindGameObjectsWithTag("enemy");
         index = Random.Range(0, 1);
         currentEnemy = enemies[index];
        
     }
 }

This is my current code and instead of choosing one person it is choosing all people with enemy tag. Please help