Hi I’m mr2ndopinion.com - Here are my suggestions!
1) Being able to pin a comment on a video
2) News section on your channel to post upcoming video titles with or without a thumbnail!
3) Subscription only tab on top!
4) Seeing usernames of people who are watching which video, if they don’t like it they can change it in settings
5) Know who unfollows or letting people who unfollow fill in a review why they unfollow
6) The ability to put enters (blank spaces) in your channel description
7) Ability to enter an album description!
That’s it at the moment!