Plz let us change usernames

My username is bonana5078 and I absolutely hate it, Ive changed my name to Maddie?, so people would see that instead, but they still see my dumb username! I dont want to make another account because I dont want to lose my streaks! Plz let us change usernames!

Heisenberg_thederg.121 about Snapchat, v10.4.2.0