To successfully address this sub-task, we need to understand the problem and extract the variables involved. The variables in this case are: social media promotion, collaborations, search engine optimization, followers, and watch time.

1. 4.1 Social Media Promotion: Utilize various social media platforms such as Facebook, Instagram, Twitter, and LinkedIn to promote the YouTube channel. Create engaging content related to self-discovery, online business, AI, and ADHD to attract potential followers. Regularly share videos, teasers, behind-the-scenes footage, and snippets to generate interest and encourage followers to visit the channel.
2. 4.2 Collaborations: Collaborate with other YouTubers, influencers, or experts in topics related to self-discovery, online business, AI, or ADHD. This can be done through guest appearances on their channels, joint videos, or shout-outs, which will help increase visibility and attract their followers to your channel. Engage with the collaborators by commenting on their videos and encouraging them to promote your channel as well.
3. 4.3 Search Engine Optimization (SEO): Optimize the channel's metadata, titles, descriptions, and tags with relevant keywords related to self-discovery, online business, AI, and ADHD. This will improve the channel's visibility on search engines like Google and YouTube, making it easier for potential followers to find your content. Additionally, esearch and implement SEO strategies to drive organic traffic to the channel.
4. 4.4 Followers: Engage with the existing followers by responding to comments, asking for feedback, and encouraging them to share your content with their networks. This will help create a loyal community of followers who will actively watch your videos and contribute to the watch time. Additionally, actively engage in communities and forums related to self-discovery, online business, AI, and ADHD to promote the channel and attract new followers.
5. 4.5 Watch Time: Create high-quality and engaging videos that provide value to the viewers. Focus on creating content related to self-discovery, online business, AI, and ADHD that is informative, entertaining, and visually appealing. Incorporate AI techniques and tools to enhance the content and make it stand out. Encourage viewers to watch the videos till the end by using storytelling techniques, interactive elements, or offering valuable insights.