Dave Smith/Business InsiderFor the past few weeks, I've immersed myself in "Fortnite Battle Royale," the most popular game in the world right now. I've been playing relentlessly, and when I'm not playing, I've been watching and studying the best "Fortnite" streamers, like Ninja. Still, after dozens of hours of playing and watching "Fortnite," I felt like I wasn't actually improving in the game.