Source for (german) audio books

Hello fellow pirates 👋 I'm sick of Audible and it's buggy app. Due to their excessive a/b testing the app stops working every second night. So I setup a selfhosted audiobookshelf instance.

However, I need my audiobooks to fall asleep and I don't want to listen to the same books again and again, so I need a new source. Do you have any recommendations? In best case in German language, in worst case in English.

Thank you in advance! ☺️