SEO helps quite enough for your web project either it’s a website or it’s a portal.
In youtube, you can check the most famous channels. They have higher pagerank. It doesn’t mean they’re working on SEO too hardly. It means they’re famous that’s why people automatically working for their channel as SEO by telling each other about their channel on forums, social media, websites, blogs, comments etc. They’re lucky but the conclusion comes again at SEO.
If you’re not lucky enough due to not getting enough views on your channel or good videos then you must work on your channel to optimize it well for search engines. Join forums, social networking sites, and discuss about your videos and channel. Comment on blogs like blogger and wordpress with a link of your channel page. Comment on other videos in youtube is a good way to gain pagerank. As much you comment on other videos, as much you’ll get backlinks for your channel page. This process takes time. But if you’re not a hopeless person then you can do the job done.
Don’t be hopeless about your attempts. Keep this in mind Creative work + Good SEO + Try Try and Try = Success.