as

SplashPage.xaml.cs

public partial class SplashPage : ContentPage
{
    IStartupTaskSequencer sequencer;
    HomePage homePage = new HomePage();

    public SplashPage()
    {
        InitializeComponent();

        sequencer = new StartupTaskBuilder()
                           .Add(new SimulateDownloadDataStartupTask())
                           .Add(new UpdateVersionStartupTask())
                           .Add(new OnboardingPage())
                           .Add(new PermissionRequestPage())
                           .Add(homePage)
                           .Add(new AdvertisingPage())
                           .Add(new HomePage())
                           .Build();
    }

    protected override async void OnAppearing()
    {
        base.OnAppearing();

        await sequencer.StartAsync(homePage);
    }
}