The thing is that they are indeed differentiated with annotations after every 4 chapters.
The way to unblock it was to respond to them with an email promising that I should not do it again and that I should unpublish anything that was "undifferentiated content". Again, all my public domain works have annotations in them but I removed all of them anyway just to eliminate any issues.
A few days later my KDP account got terminated even though I had removed the ten that used public domain. There were 60 ebooks remaining that are original content - no PLR, no public domain. Just pure original content.
My question in this thread is:
If I open an LLC in the State of Nevada (where I live) and therefore have a new EIN tax number, can I re-open a new KDP account? Has anyone ever done this? I will, of course, submit entirely new works that are totally different from the works that I had in Amazon. And yes, no more public domain.
Since my account has been terminated, what will happen to payments from past royalties? I had sales in January and February that won't get paid until two months later, which is their standard payment timeline.