Oh, you’re past the inciting incident and you haven’t reached the end just yet. You have a few thousand words to go through before you get there. And by a few I mean about 30,000? I’m low balling, by a lot. Anyhow, when you get to the flabby middle section of your book the most important thing is to keep moving.

Fresh out of Ideas. What to Write?
Out of Ideas? 😦 What should you do if you’re in the middle and you find yourself out of ideas? This is where leading a meeting or running a RPG comes in handy because nothing says pull something out of the air right now like having a table full of expectant faces. Yikes. Literal nightmares. But, after a long while, after a very very long while, you get used to it. And you find that, yes, you can pull things out of the air. You’ve studied them so much that they spill out.
But wait, maybe you’re not to that point yet! So, what do you do? Well, I look up plot hook ideas because, surprise, the plot doesn’t happen at the beginning and the end of the story alone. A whole lot of it happens in the middle too. These guys can give your characters enough juicy action to keep kicking through the slump of your book.
So, here’s a pair of useful places to look:
I also recommend Save the Cat, Writes a Novel. It has some excellent plotting advice which should help you string your story quite nicely.

Why a Bad Scene Is Better Than None
A bad scene can be rewritten. Half of the battle is getting through the middle of the book. If you can make it to the end you can re-hash, re-smash, and honestly re-write a lot of things. A bad scene is good because you know it’s bad. A bad scene can be tossed or re-written. So, write a scene you hate. Write a scene that sucks. If you write it, you’ll reach the end, and you’ll know how to change it when you go back.
In fact, Brandon Sanderson openly admitted in his lectures that he makes revision notes as he writes his first draft. This is perfect. If you really don’t like a scene, you can make a note about how you’ll do it better next time around. And thus, you’ll reach the end of your book.

Keep Writing
Never give up. Even if you can’t make it this time, keep trying. Don’t give up and try to keep writing even through the terrible bits. You’ve got this. Feel free to comment below. Do you disagree?