CROSS PROMOTION AND COLLABORATION
Collaborating with and promoting other creators in the community can be one of the most powerful ways to reach new audiences. Other YouTube creators are a critical part of your community on YouTube.
Create a strategy to cross-promote your content to relevant audiences
Find and reach out to channels with similar audiences for collaborations. Leverage each other's audience to find new viewers!
Appear, guest-star or contribute to other channels and vice-versa. Record video chats, hold Hangouts on Air, or incorporate video from a collaboration partner on your channel.
Use end cards, playlists, links in description and clear direction within the video to help the viewer watch more.
Be active on your channel during any cross-promotion period. Interact with new viewers. Feature your best videos or playlists when you expect a lot of new viewers might be visiting your channel.
Make sure to have an effective programming schedule after cross-promotions. The content you publish in the weeks after gaining new subscribers will determine if these new viewers remain subscribed and active with your channel.
Think holistically about your YouTube community
Sure, it includes your most avid fans and followers, but it also includes other YouTube creators. Identify similar or relevant channels and invest in these relationships. Accessing new audiences on YouTube begins with finding the channels where those audiences are already engaged. It’s a good idea to identify similar or relevant channels with whom to work on cross-promotion and collaboration in a mutually beneficial manner. Though, first you must do the work to build your content, your channel, and your audience into something that other channels will want to support.
Use Social Media to cross promote
Collaborations must have clear annotations and links in the description to subscribe to the guest channel.