Make UI20 Great Again is a mod for the Twitch app that aims to create a dank and top secret society for Twitch. It will add a lot of new features to your Twitch app, including a new UI skin for Twitch, a bunch of emotes and emote skins, a chat room that is called the "Clubhouse", a separate profile tab, and more.

It's still in its infancy, so there's still a lot of work to be done, but that doesn't mean that it isn't useful already. It's intended to be a companion app for UI20, so you won't be able to use it without that extension.