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Have you tried adding to the books that are currently in your portfolio? Or is everything at the maximum size?
I tend to combine novels on here even if I could do a few more books just because it's easier and some have similarities. I also have a couple for activities but haven't reached the limit on a single book item for posting. If you try to add to those books and it doesn't work, then maybe you can look for some options. But first maybe try to see how much you can keep in each book and just make sure to label the "chapters" or other entry forms so you don't get things mixed up in the same book item.