Here’s a decent list: https://wiki.archlinux.org/title/Desktop_environment#List_of_desktop_environments
Arch based list obvs so won’t include every single one but not too shabby.
Deepin was my long running DE for a while until they changed to be more windows like and I ditched it for budgie. Shortlived as it just wasn’t being maintained and updated enough for my liking. Moved to Pantheon for quite a while but it got annoying having to fix it breaking with updates. I ditched it and was going to go back once they released the distro agnostic version. I don’t know if that ever eventuated because I gave up waiting and have been happy with KDE for several years now.
I would totally play that