Hi, Axel,
My name is Didi. I'm happy to help you today.
I hear your situation. I'm afraid to say, however, that having a just member role in a team won't enable us to change a team's name.
For that reason, I invite you to submit a feature request at Teams UserVoice by clicking the Help icon on the app then select 'Suggest a feature'.
If the feedback feature is disabled on your account, you can go directly to https://microsoftteams.uservoice.com/forums/599...
Best regards,