A user should be able to revert their display name at any time without having to wait a week in case they misspell their display name or for any other reason.
At the current moment one must wait at least seven days after changing one’s display name- this is incredibly unforgiving. I’m not sure why the restriction is currently set to a week in the first place (perhaps so the feature cannot be spammed and slow down servers?) but no matter the reason, there should be an option to revert your display name,
I don’t think this needs much more explanation. If Roblox were to add this feature, users would be able to revert a username they misspelled or for other reasons.