enemy Raycast cone detection

so i have this enemy ai with cone detection of the player, however, the enemy only detect the player when the player is in either one of those 3 white line, how do i make the enemy detect the player within the cone area? my code below. and how do i make the cone thinner?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.AI;
 
 public class enemyControl : MonoBehaviour
 {
     Ray enemyRay;
     public Color rayColor;
     RaycastHit rayHit;
     bool follow;
     public float sightDist;
     private float timer = 0f;
     public float heightMultiplier;
 
     private Vector3 investigateSpot;
 
 
     private NavMeshAgent agent;
     public GameObject him;
 
     void Start()
     {
         agent = GetComponent<NavMeshAgent>();
         him = GameObject.FindGameObjectWithTag("Player");
 
         heightMultiplier = 1.36f;
     }
 
     void Update()
     {
         timer += Time.deltaTime;
         //enemyRay = new Ray(transform.position, transform.forward * sightDist);
         Debug.DrawRay(transform.position + Vector3.up * heightMultiplier, transform.forward* sightDist, rayColor);
         Debug.DrawRay(transform.position + Vector3.up * heightMultiplier, (transform.forward  + transform.right).normalized * sightDist, rayColor);
         Debug.DrawRay(transform.position + Vector3.up * heightMultiplier, (transform.forward - transform.right).normalized * sightDist, rayColor);
 
         if (Physics.Raycast(transform.position + Vector3.up * heightMultiplier, transform.forward, out rayHit, sightDist))
         {
             if (rayHit.collider.gameObject.tag == "Player")
             {
                 agent.SetDestination(him.transform.position);
                 him = rayHit.collider.gameObject;
             }
         }
 
         if (Physics.Raycast(transform.position + Vector3.up * heightMultiplier, (transform.forward + transform.right).normalized, out rayHit, sightDist))
         {
             if (rayHit.collider.gameObject.tag == "Player")
             {
                 agent.SetDestination(him.transform.position);
                 him = rayHit.collider.gameObject;
             }
         }
 
         if (Physics.Raycast(transform.position + Vector3.up * heightMultiplier, (transform.forward - transform.right).normalized, out rayHit, sightDist))
         {
             if (rayHit.collider.gameObject.tag == "Player")
             {
                 agent.SetDestination(him.transform.position);
                 him = rayHit.collider.gameObject;
             }
         }
     }
 
     void OnTriggerEnter(Collider coll)
     {
         if (coll.tag == "Player")
         {
             agent.SetDestination(him.transform.position);
             him = coll.gameObject;
         }
     }
 }

[1]: /storage/temp/126350-raydirection.png