There are many people competing for the attention of youtube channels. To increase your traffic you have to be consistent, unique and resourceful. Being serious and posting videos with similar predictable formats are not going to be useful. You have to be creative,focus on content and names that will attract the curiosity of the viewers,youngsters who are outgoing and have a narrative style are often more successful. While creating videos and uploading, think as a viewer and not as the creator of the video, then you'll understand what is right or wrong. Choose a funny title or think of catchy phrases. Always remind viewers to subscribe at the end.