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Don't worry about it in your first draft. Wait until your second, possibly your third. Your first draft is to get the story down on paper. Then you let it sit for a month and go back. The second dr...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/24937 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/24937 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Don't worry about it in your first draft. Wait until your second, possibly your third. Your first draft is to get the story down on paper. Then you let it sit for a month and go back. The second draft is to fix all the glaring errors you pick up in your first review. After a second (fourth, etc.) round, hand it off to a trusted reader. Ask the trusted reader _after_ the reader is finished if the subplots were obvious enough. Take the reader's suggestions to beef them up. This is an obstructed arborvision problem: you won't be able to see the forest for the trees, because it's your story and you know where all the plot threads are. You have to ask for outside opinions to get perspective.