You want excellent engaging content, even if it is the same game done by the top Youtubers. If you are into another niche then make sure your videos are top quality, that means $50k camera to make you look nice, a backdrop, maybe a studio setup, and even a professional microphone. If you are into something like animation make sure your quality is the same level as tv studio animation i.e. Teen Titans Go and Cowboy Bebop.
Also expect to only earn about 25% or less of your views every month at low rates like $0.01 per ad click. The nobodies don't have legions of loyal avid subscribers willing tot turn off Adblock just so they can earn big. That comes with great quality content, and the big money comes from companies trying to directly sponsor you with their products and such independent of Google.
TLDR? Make excellent big production quality content, expect only getting $0.01 for 25% of your total monthly views, and finally boost your channel like a mad man in order to go viral.
