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First, 90K is a very respectable word length for a novel, so make sure you're not just trying to meet an artificial goal when your book is already complete. Personally, I much prefer books lean, a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30586 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
First, 90K is a very respectable word length for a novel, so make sure you're not just trying to meet an artificial goal when your book is already complete. Personally, I much prefer books lean, and with no extra fat on them. Second, it's hard to give generic advice without knowing where exactly your book might be weak. Your characters might be thinly drawn, or lack backstories, or internal lives, or be unsympathetic, or your descriptions might be weak or your plot might benefit from a subplot, but it's impossible for us to know which (if any) is true. So my advice would be to not start from "I need words, what good ones can I put in" but rather "what is my book lacking?" If your intervention isn't filling in a specific gap in your story, it's likely to feel grafted on and superfluous. As a push in the right direction, mainly we as writers err by not putting on the page those things in our heads that help us see vividly and understand the characters and their world. Remember, if it isn't on the page, in some fashion, _it doesn't exist for the reader._