Okay, I've reviewed your books as you asked, even though I'm really not a professional, but...
Two of your books have the same covers. Try to change one of them.
Most of your books have the same description, which really aren't description of the book at all. You need to briefly describe what your book is about.
And, and this is just me, your chapters are too short and there aren't much actions or scenes written. I want to say it's bleak, but that would be very wrong of me. Try to go for longer chapters, but not too long otherwise your readers will lose interests quickly. That's also just a personal thing for me.
And finally, if you wanna write a fanfic, try to stick to the plotline of a show. If you wanna go off track, go for it. But don't go completely off the rail, because then the show you're writing from is meaningless.
For example, my Demon Slayer book. The beginning is completely different from the show, and it's a little bit of a side story to explain or reveal the reader's lifestyle and past. But the rest of the time, I stick closely to the plot.
Hope this helps you! And that I wasn't too harsh!
