in November 2021 I canceled and deleted the domain arzt-muenchen.net. I have never used the Cloudflare service, and my previous provider has nothing to do with Cloudflare either.
Now someone else has registered the domain arzt-muenchen.net. Calling the website https://www.arzt-muenchen.net shows old content, that is around one year old. As a result, all of the data is no longer correct.
What can I do so that the old content is not displayed when I visit https://www.arzt-muenchen.net?