Steps
- Open the username change screen.
- Type your old name.
- If it saves, you have it back.
If not
Someone else has it. Then a route is needed.
Keep
Screenshots of the old profile.
Official sources
Platforms change their help pages and forms often. Follow the wording on your own screen and the current Help Center. Usernm is an independent service and is not affiliated with Meta or any platform named on this site.