“Your personal growth affects how & what you write, and vice versa. Working on one piece this long means you are already a different person than when you started. So you need to be writing a different book. Trying to turn the book you needed then into the book you need to write now is going to keep you frustrated.”
You are absolutely right! I had a sneaking feeling this was what was going on, thanks for putting it into such sensible words. If I finish writing this book at 60 it’ll probably be a completely different book! I’m saving your advice in my bujo as I write.