The one thing i noticed straight away is that for someone who is on youtube for a year you don't have many video's.
To grow you need to be consistent by uploading at least 3 times a week.
Besides that i would add a channel trailer to grab the attention of newcomers.
Use your about section to tell something about your channel, what content do you make, what makes you unique?
Organize your home screen with a Uploads/Populair Uploads/Playlists section for better overview.
Lastly as mentioned above work in the thumbnails