I just can't understand

Is what I am doing even possible??? Because it doesn't work it doesn't even throw exceptions

[AttributeUsage(AttributeTargets.Field, AllowMultiple = true, Inherited = false)]
public class ScreenObject : Attribute
{

}

public class MenuCanvasController : MonoBehaviour

[ScreenObject] public GameObject wellcomeScreen;
[ScreenObject] public GameObject wellcomeMenuScreen;
[ScreenObject] public GameObject RegistrationScreen;
[ScreenObject] public GameObject SignInScreen;
[ScreenObject] public GameObject HomeScreen;

public static MenuCanvasController instance;

private void Awake()
{
    instance = this;
}

void Update ()
{
    (typeof(MenuCanvasController).GetField("wellcomeScreen").GetValue(instance) as GameObject).SetActive(false);
}

I want to make simple functions for controlling a so that my friend will stop write code like this ...

public void GoToRegistrationScreen()
{
    Debug.Log("Make some transitions ");
    wellcomeScreen.SetActive(false);
    wellcomeMenuScreen.SetActive(false);
    RegistrationScreen.SetActive(true);
    SignInScreen.SetActive(false);
    HomeScreen.SetActive(false);
}