If your software has a "hi-lighter" option try putting things in different colors.
Blocks of dialogue in yellow.
Data dumps in green. (Helps you spot all the "tell not shows" that snuck in!)
Other colors for descriptives (these can also be data dumps) plot points, character revelation, etc.
If the colors are evenly distributed, then you've probably got a balanced, well-paced book. If you have 15 pages of data dump to one line of plot point it's time to trim or redistribute!
When this is fixed to your satisfaction, do the same for word reps. Sometimes these are only visible in a hard copy. I go through mine with a hi-lighter and read it aloud. The whole book. Awkward structure jumps out fast when you read aloud. If it takes more than one breath to say a line, trim or break it up.
Get Elements of Style if you've not already gotten it.
Get rid of all the "There was, It was, and Suddenlys" if they start more than a reasonable number of sentences per chapter. These days I never use "suddenly" as I always think of Snoopy on his dog house: "Suddenly a pirate ship appeared on the horizon!"
No exclamation points in narrative. If your words don't generate excitement, then comic book punctuation won't help matters.
Make sure you have proper breaks when you do a viewpoint shift.
Unless you're going for a Style Thing, make sure every narrative sentence has a noun and a verb and an object. (I've edited a NYT best-selling writer who still doesn't get that and it annoys the heck out of me.) Never end a sentence with a preposition. (That writer does, and I wanna brick, a BIG brick, to throw.)
Spell-check, grammar check: (Effect and affect, further, farther, their, there, your, you're, its, it's, are common gotchas.)
Look up in an old fashioned paper dictionary ANY words with meanings you're not certain about.
Make sure your main characters have names beginning with different letters. Michael, Miles, Millie, Milton = reader confusion. Michael, George, Sally, and David are better.
Watch for names with similar endings too. Emily, Maralie, Loralie--not good!
Change a name if you have to and keep a "style sheet" with each proper name and its correct spelling as used in your book. You'll want to include a style sheet for the copy editor when it sells.
When ALL that is done, then find a beta reader. Find a merciless beta reader who will help you make the book even better. The idea is to have a good book, not egoboos. Those come later when it's in the stores.
Good luck!