Apple Community users can’t remove the balance from your account.
Since $0.25 is less than the price of a single item, contact Apple Support and ask them to clear the remaining Apple Account balance so you can change regions. Apple specifically recommends contacting Support in this situation.
You may also need to cancel active subscriptions and wait for any pending purchases or refunds before the country change will go through.
A friendly note: This is the German-language Apple Support Community. Posting your question in German will make it easier for more members to understand it and offer assistance.