Honestly it doesn't need one. A slogan is almost as bad as animated avatars, but not quite.
resetERA is already a slogan and a name too.
I like New Game + but it isn't needed alone from a visual perspective. It would always look kinda messy. (it always did on that "old place")
I always thought it looked like a Matrix fan forum or X-files lol.
"New Game +" would at least be on topic, so yeah, it doesn't need a slogan though.
Also I'm confident the people responsible know what they're doing.
Sorry for the long post. Gonna go sleep now
❤(ӦvӦ。)