I've often advised writers to perform a That-ectomy on their work. Search out all instances of THAT and make sure you need THAT word then and there. Often times, you don't.
I'm adding a word to the -ectomy list: and
I've been noticing a lot of writing that connects things that aren't linked.
Run on sentences, or just long ass sentences often link two things that don't fit together.
This can rob your pages, and novel, of energy.
It's too daunting to think of and-ectomizing your novel. The thought of it gives me the shivers and my reputation for being mean and cruel is already burnished enough (see what I did there?)
Just take a look at the pages you send with your query.
If you see a lot (like more than three) of instances where you've linked things that shouldn't be, you'll know it's also in your novel. Set a schedule of 3-5 pages a day and tackle it.
Once you know to start looking for this, you'll see it on the first revision passes you do.
Let me know what you find!