Some great ideas here! Charlaquin had the right of it - what fun interesting creative stuff would you do? The corporate branding stuff, that'll be this person's "real job"; but not v interesting except in so far as it does provide some creative constraints.
I just want a setting that's all floating islands, some sort of Shattered World setting.
I also want an official 5e modern-ish setting. Victorian or late Age of Enlightenment type setting.
One thing I would do is to release micro chunks of the settings somehow on D&D Beyond and see what the response to them is in terms of engagement (yes, I know, that word has a bad rap; but as a product manager, understanding what customers are actually interested in as opposed to what they say they are interested in, is what makes or breaks a product). By micro-chunk I mean something like a a 5-room dungeon encounter sequence - with a social encounter, a non-monster encounter, an exploration bit; a combat; and then the reward in some way. That's super themed to the actual grand setting.