The issue is the content FFXIV offers, most content is very laid back and a 1 and done spectacle, this doesn't help to keep content creators busy.

The content FFXIV has over its competitors is also not beneficial to keeping a high viewer rating, crafting, no one is going to want to sit and watch someone craft ad nauseum especially for new viewers, Story, spoilers duh but it is a 1 and done deal not going to be reaping in views via story, all challenging content is long on the archive list for a lot of content creators, news has been slow from the devs on updates understandably because of Convid.

FFXIV is just not a game that is made to hold viewership beyond 1st few weeks of a patch, ultimately I think that is ok but the only real way to bolster its viewship is to actually give more challenging content, stuff like savage dungeons, savage solo etc, even then it'll only boost it for a few weeks at most.