Tried (briefly) looking for a Discord server dedicated to general UI and addon discussion but couldnt find one so I set one up myself. Its called “WoW UI” and is open for anyone to join:
Its not meant to replace the dedicated servers for the individual developers addons community (in fact there’s plenty of links to all those servers as well as links to download the addons), its just a central place people can come to ask questions, discuss anything to do with UI and addon usage, get recommendations and show off their UI.
Feel free to join, and have fun in Shadowlands