I started a new book about five weeks ago but I didn't publish it because I didn't really have a plot for it. Once I did, I published it, which was yesterday. No one read it, so I decided to unpublish it. Then, this morning someone else published a book that I was excited to read. Until I read the first chapter.
It was similar to what I had in the introduction. Now, I don't want to accuse them of copying, because they have a huge fanbase and I don't want to be attacked. But I also don't want to publish the book again because I don't want to seem like I am copying them.
EDIT: If you're wondering how big that fanbase is, lemme just say that a new chapter from them can get at least 200 votes in less than 15 minutes. I'll have to wait about one year to get that many votes. Also, I didn't copy them by making a demon book. I got the idea to write a demon book from them but with a different plot.