I found this in some of my old writing notes. It was good for me to read. Hope it's helpful for you also.
This is the biggest reason manuscripts get rejected. You’re telling a wonderful, powerful, gripping, complex story... but you’re the only person who actually knows that. Everyone else sees a long, rambling, uneven tale of various events happening to various characters. Why? What makes these things happen? And, most important to your reader, why are you telling us this?
Every novel needs a focus. What’s your point? What is it that you want the reader to know? That focus is your Climax, the one part your story simply could not do without. “I died of romanticism.” “I almost got et by a whale.” “I pretty nearly wrecked my life being a selfish grinch.”
At the same time, every novel needs a really good reason for the reader to care. That’s your Hook. The reader may have picked your book up for its snazzy cover, but you desperately need them not to put it down.
And every novel needs a series of intriguing, hair-raising, addictive events carrying the reader from the Hook to the Climax. You could just tell us the Climax. “The butler did it.” But long fiction is all about the wonderful, rollicking adventure building upon why that matters.
The hardest thing for aspiring writers to believe is that all this is holographic: what’s essential for the novel is also essential for the chapter, episode, even scene. Every single one of them needs a Climax, Hook, and some type of events leading from one to the other.
Read that again. Every single one.