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Fix it now. If you realize you made a mistake, go back and fix it now. Not, I stress, because the last 20K would be "wasted," because no writing is wasted, but because it's clearly blocking you an...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/27989 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27989 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Fix it now. If you realize you made a mistake, go back and fix it now. _Not_, I stress, because the last 20K would be "wasted," because no writing is wasted, but because it's clearly blocking you and _you don't want to write it._ Carve off whatever pieces aren't going to fit and put them in a slush file. I like this method because it feels less painful than outright deleting, and because sometimes I can reuse or repurpose character beats or even specific sentences or phrases somewhere else in the book.