Offline listening not possible

[Klawusel]

Plan

Premium

Country

Germany

Device

iPhone 7

Operating System

iOS 12

My Question or Issue

Each time I want to download an audio book I get the warning that there is no more space in my library. I attached a screenshot below. I have about 50gb free on my phone and already cleared the cache and removed the download marker for each album I downloaded before. I also removed all devices in my account and tried reinstalling. But nothing helps. Isn‘t there a way to just kill my local library and start from scratch? Additionally I do not see a way to remove a single album from the library!