Check out the Fullscreen forums and interact with our Facebook and Twitter pages to help with the visibility of your channel:
However, the best promotion you can do is making your channel’s metadata as strong as possible so potential fans can find your content through search and recommendations. You can see Fullscreen’s recommendations for SEO here: https://support.fullscreen.net/hc/en-us/articles/201815034-How-can-I-grow-my-channel-
And if you haven't already, go to http://community.fullscreen.net to set up your Fullscreen community profile and start sharing your videos with the rest of the network. Discover, follow, and network with other great Fullscreen creators also by using the new creator directory. You can filter your search there by location, channel type, channel size (aka "reach"), and audience. You can also find a great group to join at https://community.fullscreen.net/groups.