The quality of your content plays a key role when it comes to being successful on YouTube. There are genre of videos that google pay more which are the educative ones. Also your viewership location, view from certain countries like the USA earn more than those from like for example kenya. Secondly consistency is always rewarding, especially when you have a huge number of subscribers who want to see new videos. Longer videos are more rewarding than shorter ones, so video duration is important. Thirdly promoting your YouTube channel through social media platforms to attract more viewership is also important.