How to end a cinematic camera cycle

Hi, I'm new in Unity and I'm learning on my own how to use it

For starters I'm trying to combine different scripts from tutorials into a new project so I can see better what how code works in different contexts

Right now I'm trying to start a 1° person test game with a cynematic sequence. I've worked out how to switch to the player camera (I've resorted to just deactivate the cinematic cameras) but the cycle keeps going. I know I should use break but I don't know how to change the code now

public static bool gameStarted = false;

 [SerializeField]
 private List<GameObject> cinematicCameras;
 [SerializeField]
 private Image screenFader;

 private int activeCamera = 0;
 private int nextCamera;

 private float timer;

 [SerializeField]
 private float timerDelay = 8f;
 [SerializeField]
 private float fadeSpeed = 8f;

 // Use this for initialization
 void Start () {

     cinematicCameras [activeCamera].SetActive (true);
     nextCamera = activeCamera;

 }

 // Update is called once per frame
 void Update() {

     // If the start game key has been pressed...
     if (gameStarted == false && Input.GetKeyUp(KeyCode.Space)) {

         // ...deactivate cinematic cameras
         cinematicCameras[activeCamera].SetActive(false);

     } else {

         // otherwise, cycle through the cameras.
         CycleCameras();

     }
 }

 private void SwitchCamera(int cameraIndex) {

     if (cameraIndex != activeCamera) {

         // If the screen fade is less then (almost) full black...
         if (screenFader.color.a <= 0.998f) {

             // ...then continue lerping the screen fader towards black.
             screenFader.color = Color.Lerp (screenFader.color, Color.black, fadeSpeed * Time.deltaTime);

         } else {

             // ...set the screen fader to black.
             screenFader.color = Color.black;

             // Change the active camera
             cinematicCameras[activeCamera].SetActive (false);
             activeCamera = cameraIndex;
             cinematicCameras[activeCamera].SetActive (true);

         }

     } else {

         // If the screen fader is not close to completely clear...
         if (screenFader.color.a <= 0.002f) {

             // ...then continue lerping the screen fader towards clear
             screenFader.color = Color.Lerp (screenFader.color, Color.clear, fadeSpeed * Time.deltaTime);

         } else {

             // ..set the screen fader to clear.
             screenFader.color = Color.clear;

         }
     }
 }

 private void CycleCameras() {
     
     // Increment a timer to count up to restarting
     timer = timer + Time.deltaTime;

     // If the timer reaches the restart delay...
     if (timer >= timerDelay) {

         // Then reset the timer
         timer = 0f;

         // Choose the next camera
         nextCamera++;

         // If the next camera is greater then the highest index in the camera list...
         if (nextCamera > cinematicCameras.Count) {

             // ...then reset to the first cinematic camera.
             nextCamera = 0;

         }
     }

     // Switch to the next camera.
     SwitchCamera(nextCamera);

     }

Some advice would be appreciated, tnx