How to manage unity script in a more efficient way?

Currently I am developing my own Unity project. While my project become bigger, I started to realize how horrible it would be to allow each component having their own life cycle.

For example, I don't know if a component needs to fetch for another component that only initial in Start method, whereas this component raises up this call in awake method. It would be a nightmare.

So I created an interface called IController, and having all the controlling components inherent from it with overriding parent method. Then I manage them in a centrol controller. It looks like this:

Public class CentrolController{
    Public NPCController npcController;
    Public MusicController musicController;
    Public CharacterController characterController;

    Public List<IController> controllers;
    Public void Awake(){
           if (npcController != null)
               controllers.Add(npcController);
           if (musicController !=null)
               controllers.Add(musicController);
           if (characterController != null)
               controllers.Add(characterController);

    }
    Public void Update(){
        foreach (IController controller in controllers)
           {
               controller.Update();
           }
    }

}

I add a reference for each controller because I want to assign them through the inspector. However it seems a little stupid because I need to change the awake method every time I add a new controller to the system, at the same time violating open close principal.

What should I do to make the script scalable?