Sorting messages by username would definitely make the inbox easier to manage, especially when you receive a lot of messages from different people. Having both username and date sorting options would make it much quicker to find older conversations. On a separate note, I recently came across a useful page with username suggestions for badminton players: https://aestheticusernameideas.com/username-ideas-for-badminton-players/. It has some creative ideas for anyone setting up a sports-related profile.