Stop clicking on “Close” or “X” buttons when a pop-up appears. Sometimes, that button is fake. It’s actually a link that opens another pop-up. Instead, close the entire tab or swipe the app away from your recent apps screen. Treat pop-ups like that one ex you don’t want to talk to: give them zero attention.
Now go ahead. Open a web page. Read an article. Look at a cat photo. You’re free. Your screen is yours again. Until the next update, that is. But for now? Victory.