> my self help consumption (across all media) has been dropping lately

I want to propose an alternative theory about why your viewership is dropping. Whatever made you originally watch self-help on a particular topic is no longer as interesting. Let's say you were struggling with (a) exercise/fitness/diet, (b) personal/romantic relationships, or (c) business/"success"/wealth. (These are easily the three biggest categories for self-help.) You watched a few hundred hours of self-help YouTube videos over a few years and you learned how to improve. Now, the content is less interesting.

I share this idea because I see a similar pattern in myself. For the self-help YouTube videos that I do watch, I am/was most interested in (a) exercise/fitness/diet and (b) personal/romantic relationships. After 1000 hours or so of this sort of content, I learned how to improve and "ascended". Now, I don't need to watch as much because my thinking on these topics is more advanced.

Deeper: How will these channels sustain themselves? It does not look obvious to me! If I were running a self-help channel, I might intentionally delete old videos after 6-12 months. Why? So that I can remake the same content again (and again)... to get a revenue boost from new(er) viewers. For anyone who is a full-time self-help content creator, probably 90% of the revenue is made in the first 30 days. (Wild guess, but there will be an extreme cliff of some sort.)