If you want PeerTube to become popular, make it easier for people to upload videos. At the moment it's too confusing and complicated; no content creator cares what "instance" means and they never will. No one who creates an account and finds that "uploads are not allowed on this instance" or encounters some similar problem is going to waste any more time trying to use it. If you leave it the way it is now, it's always just gonna be by nerds for nerds. And more people are going to be enslaved by Big Brother who controls YouTube. So please make it accessible to normal people.
Peertube was born from a french non-profit (Framasoft) as part of their "Degooglizing internet" campaign. It's intended to be deployed to empower existing communities to share videos, rather than as a generic video upload service.
It's just like you create a blog: you need to find a host for it and most websites don't allow you to just start uploading content.
A growing number of non-profits are starting to embrace it and for that usecase Peertube is perfect. If there's no peertube instance for your community/usecase, you could start one with a few friends/neighbors.