enemy look at GameObject player? unity ver. 5.2 C#

How do I make my enemy look at my player in the scene. I haft to use gameobjects because the enemy is spawned. Here is my script:

 public class enemymovement : MonoBehaviour
 {
     public float speed;
     public bool notinrange = false;
 
     public float C1, C2;
 
     public Transform target;
 
     public GameObject player;
     
     public float fireRate, FireSpeed;
     public GameObject enemyBullet;
     public Transform spawn;
 
     public int health, value;
     public Vector3 Playerpos;
 
     void Start ()
     {
         player = GameObject.FindWithTag("Player"); 
     }
     
     
     void Update ()
     {
         
         
       if(notinrange == true)
         {
             transform.position = Vector3.MoveTowards(transform.position, target.position, speed);
 
             if (Time.time > C1)
             {
                 C1 = Time.time + C2;
 
                 Vector3 euler = transform.eulerAngles;
                 euler.y = Random.Range(0f, 360f);
                 transform.eulerAngles = euler;
             }
         }
       if(notinrange == false)
         {
              transform.LookAt(player);
              if(Time.time > fireRate)
             {
                 fireRate = Time.time + FireSpeed;
                 Instantiate(enemyBullet,spawn.position,spawn.rotation);
             }
         }
       if(health <= 0)
         {
             player.GetComponent<playerMovement>().score += value;
             Destroy(gameObject);
         }
 
     }
    private void OnCollisionEnter(Collision collision)
     {
         if(collision.gameObject.tag == "Player")
         {
             player.GetComponent<playerMovement>().score += value;
             Destroy(gameObject);
         }
         if(collision.gameObject.tag == "bullet")
         {
             health -= 1;
         }
     }
     
 }

Thanks!