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I think it's easier to cut than to add. Therefore, since you seem to be very good at outlining and sticking to your outline (yay!), perhaps you would benefit from adding more branches to your tree...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/27111 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/27111 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think it's easier to cut than to add. Therefore, since you seem to be very good at outlining and sticking to your outline (yay!), perhaps you would benefit from adding more branches to your tree, i.e. your outline. So -- see if you can add some subplots, built around side characters. Perhaps it would be helpful to read _Middlemarch_ by George Eliot, and think about all the different characters and subplots that could be going on, and interacting, in the place where your novel takes place. However, there is something to be said for novellas.