upscaled window in monogame

public class Game1 : Game
    {


        private GraphicsDeviceManager graphics;
        private SpriteBatch spriteBatch;
        private RenderTarget2D renderTarget;
        private int gameWidth = 320;
        private int gameHeight = 180;
        private Rectangle upScaledResulution= new Rectangle(0, 0, 1920, 1080);


        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            IsMouseVisible = true;
        }

        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            graphics.PreferredBackBufferWidth = 1920;
            graphics.PreferredBackBufferHeight = 1080;
            graphics.ApplyChanges();
            renderTarget = new RenderTarget2D(GraphicsDevice, gameWidth, gameHeight);
            base.Initialize();
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            //load your content like normal here

        }

        protected override void Update(GameTime gameTime)
        {


            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();



            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.SetRenderTarget(renderTarget);
            GraphicsDevice.Clear(Color.CornflowerBlue);
            spriteBatch.Begin(samplerState: SamplerState.PointClamp);

            //draw your sprites, just like you normally would here


            spriteBatch.End();
            GraphicsDevice.SetRenderTarget(null);
            spriteBatch.Begin(samplerState: SamplerState.PointClamp);
            //this will draw the rendertarget to the screen
            spriteBatch.Draw(renderTarget, upScaledResulution, Color.White);
            spriteBatch.End();


            base.Draw(gameTime);
        }
    }