I wish I could remember where I read this tip but it worked really well for me. The tip was simple advice for beginning authors:
Delete you first three chapters.
Oh my God. That worked so well for my story I cannot believe it.
The main function of my first chapter is to hook the reader so well that they cannot put down the book. I want the reader that reads preview pages on Amazon to press one click just to see what happens next.
Most of the first three chapters I cut had utility later. Some of it just was not necessary.
--Only about 20 chapters left to review in the cut phase.