To get new stories, open your app and swipe down on the screen. Check that you're connected to Wi-Fi or mobile data. If the app closes or specific content is blank, learn how to clear your app's cache and data.
If you use the Discover feed inside the Google app, you should check if it's enabled or not. In case it's disabled, you will see a blank white screen, and the feed will not work. To check that, open the Google app on your phone and tap on the More tab.