How to make script awake again after sleep?

I disabled gamecontroller for 15.9 seconds and controller not awake again.It's for cutscene cam before the race start.

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// Move and rotation camera controller
/// </summary>

public class CameraController :Singleton<CameraController>
{
    
    [SerializeField] List<CameraPreset> CamerasPreset = new List<CameraPreset>();   //Camera presets
    [SerializeField] CarController OverrideCar;
    private GameObject cam;
    int ActivePresetIndex = -1;
    public CameraPreset ActivePreset { get; private set; }

    CarController TargetCar { get { return OverrideCar?? GameController.PlayerCar; } }
    GameController GameController { get { return GameController.Instance; } }

    float SqrMinDistance;
    int CurrentFrame = 0;

    //The target point is calculated from velocity of car.
    Vector3 m_TargetPoint;
    Vector3 TargetPoint
    {
        get
        {
            if (CurrentFrame != Time.frameCount)
            {
                if (!OverrideCar && GameController == null || TargetCar == null)
                {
                    return transform.position;
                }
                m_TargetPoint = TargetCar.RB.velocity * ActivePreset.VelocityMultiplier;
                m_TargetPoint += TargetCar.transform.position;

                CurrentFrame = Time.frameCount;
            }
            return m_TargetPoint;
        }
    }

    protected override void AwakeSingleton ()
    {
        CamerasPreset.ForEach (c => c.CameraHolder.SetActive (false));

        ActivePresetIndex = GameOptions.ActiveCameraIndex;
        UpdateActiveCamera ();
    }

    private IEnumerator Start ()
    {
        cam = GameObject.FindGameObjectWithTag("cam");
        ActivePreset.EnableRotation = false;
        GameController.SetActive(false);
        yield return new WaitForSeconds (15.9f);
        GameController.SetActive(true);
        cam.SetActive(false);
        transform.position = TargetPoint;
        ActivePreset.CameraHolder.rotation = TargetCar.transform.rotation;
        ActivePreset.EnableRotation = true;
    
    }