Bulk Delete DMs and Ability to Delete All The Messages You've Sent in a Group Chat That You Left or Got Kicked From

This feature lets users have more control over what they've sent through out there time chatting on Discord. The ability to bulk delete DMs should be a feature because when you "close" a DM, all it does is that the DM is archived so you don't see it, but when you re-message that user again, all your old messages come back. 

The ability to delete all messages for group chat is also important, what if you shared private information to your classmates and after leaving the school, they kicked you, but your information is still there and your classmates can share it to anyone they like. Or maybe you just said something embarrassing and want to delete it, but sadly, they kicked you out of the group chat. This feature lets you stop overthinking about how they will judge you and erase your memory of the paste.