YouTube's channel home page is the conversion surface almost nobody optimizes. Most creators focus on video SEO. Titles, thumbnails, descriptions. And leave the channel home as an afterthought. That's the page a viewer who liked one of your videos clicks through to, and the one that decides whether they subscribe.
The YouTube Channel Authority Audit scores the channel home against the five things that actually move subscribe-rate. Channel trailer set (it auto-plays for non-subscribers). Playlists organized (triple session duration for viewers who come from search). Banner image uploaded. About description ≥ 50 characters with keywords. Recent upload cadence.
The trailer is the biggest miss. YouTube built a whole auto-play feature specifically to convert cold visitors, and most channels don't have one. Recording a 90-second "what this channel is about, post here weekly, here's why" clip and uploading it as the channel trailer is the kind of low-effort-high-leverage change the audit is designed to surface.
Methodology: Chapter 16 of The $97 Launch, YouTube Strategy & SEO Optimization. Chapter 10 of The $97 Launch walks through MrBeast and MKBHD case studies that cover the disciplined channel-home approach at scale.