C# – How to keep a hosted service alive in asp net core 3.1

how are you?.

I have a web api in net core 3.1, this in turn contains a service that every X minutes has to run to perform data migrations (I'm just testing it), but I have 2 problems.

1. For the service to run, I must first run some url of my apis. The question is: How can I make this service start automatically, without the need to run any api?
2. When I stop using the apis for a few minutes, the service stops working. The question is: How can I keep the service "Forever" alive?

I must emphasize that my web api is hosted in a web hosting, where I do not have access to all the features of IIS

This is my code, and in advance I appreciate your help.

MySuperService.cs

 public class MySuperService : IHostedService, IDisposable
{
    private bool _stopping;
    private Task _backgroundTask;
    private static readonly log4net.ILog log =log4net.LogManager.GetLogger(typeof(MySuperService));
    public Task StartAsync(CancellationToken cancellationToken)
    {
        Console.WriteLine("MySuperService is starting.");
        log.Info("MySuperService is starting.");
        _backgroundTask = BackgroundTask();
        return Task.CompletedTask;
    }

    private async Task BackgroundTask()
    {
        int contador = 1;
        while (!_stopping)
        {
            Console.WriteLine("MySuperService is working--> " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            log.Info("MySuperService is working--> " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            await Task.Delay(TimeSpan.FromMinutes(3));
            contador++;
        }

        Console.WriteLine("MySuperService background task is stopping.");
        log.Info("MySuperService background task is stopping.");
    }

    public async Task StopAsync(CancellationToken cancellationToken)
    {
        Console.WriteLine("MySuperService is stopping.");
        log.Info("MySuperService is stopping.");
        _stopping = true;
        if (_backgroundTask != null)
        {
            // TODO: cancellation
            await BackgroundTask();
            //await _backgroundTask;
        }
    }

    public void Dispose()
    {
        Console.WriteLine("MySuperService is disposing.");
        log.Info("MySuperService is disposing.");
    }
}

Program.cs

public class Program
{
    private static readonly log4net.ILog log = log4net.LogManager.GetLogger(typeof(Program));
    public static void Main(string[] args)
    {
        ...
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            }).ConfigureServices((hostContext, services) =>
            {
                services.AddHostedService<MySuperService>();
            });
}