The promotion of a YouTube channel is a set of measures to optimize video content to: improve the ranking factors, raise the position in SERPs for specific user queries, retain the target audience with subsequent monetization of this traffic.

Hundreds of thousands of hours of video content are being uploaded to YouTube every day. It is possible to watch a video from every corner of the globe, there's a multi-million viewers audience, which makes an advertisers job easier.

Optimization of a Youtube channel.
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As for the optimization of the channel itself, its structure, design, and main page content are important here.
The welcome page of the channel should be interesting, attractive, and different from your competitors.
Usability also plays a significant role in a Youtube channel promotion. Therefore, it is very important to upload the videos to a YouTube channel in a correct way.