I am adding more details in the world building, that is the first big/tiny change. Currently there are just fae. High and Low Borns. I want to change that and talk about faeries, with multiple species and types.
The second thing is I want to tie my future book, The Dark Queen, into this book. So it is in the same universe, different characters. To do this I am changing some of the character's magic and abilities. I am also changing how/when/and if the MC ever gets her magic back. It is much better this way and has way less plot holes.
I changed a few character's names too.
I also want to add more story arcs so that I can later write short stories or books about other characters in this book.