I love your thumbnails, profile picture and banner! They are all really awesome and professional. I like the outro music and the outro itself. However, something that I noticed is that you do not have your outro annotated. You should add annotations to link your videos in that outro. It will help raise the views for all of your videos.
For such a professional person like you. I really suggest a proper channel trailer. Having just any random video would not do enough. To show people that you are serious about Youtube, and also to let them know what to expect to see in the channel. Add a channel trailer. It takes a maximum of an hour to do, edit and upload and it helps out a lot.
Personally, I suggest that you vary your content instead of sticking to just one game. It will make you exposed to a wider audience. However, the downside is that that audience might be subscribed just to see one type of your content.