I got a chance to take a look at your channel. I feel you need to enhance your channel, like add a featured section and channel trailer. I would consider getting/making a better logo, as it is just your username in red, and isn't that helpful for branding. (The video watermark is barely visible, and you should want your watermark visible.)
Speaking of watermarks...have you ever considered using a screen recorder without a watermark? Or even just a screen capture thing, as your videos are just images with music. You should learn how to take a screenshot without using Cyberlink as it leaves an unattractive watermark by your videos.
Your channel being the nature that it is, the thumbnail can pretty much be any frame of the video, so that's good.
In my personal opinion, I think you could enhance your YouTube banner. nothing is necessarily wrong with it, I just feel like...I don't know, it bothers me for some reason.
Finally, the reason your channel link was not working was because you didn't enter all the "code." You entered "UCg0C-h8dKbNAXwm6xRG" as your channel, so it doesn't exist. You should have entered "UCg0C-h8dKbNAXwm6xRGSmzg" without the quotes to get it to work. Hope I could help
Also, sorry if I sounded mean. My purpose here was not to offend you, but give you honest feedback. If you have time, could you give me feedback, too?