We should be able to change our usernames

This has been discussed many times. It's not going to happen because of how usernames are handled here in the database. You might just as well spend your time discussing the weather.

Ok @Doofenshmirtz. If Lichess can't change usernames, could they please change the weather? South Germany would be sufficient for now.

Usernames cannot be changed for technical and practical reasons. Usernames are materialized in too many places: databases, exports, logs, and people's minds. -FAQ

Welp-