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Your brain is convinced it's done with the first draft, which means it's time to start the second draft on the story cleaning up everything and filling up any missing details as needed. Which is a ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/48920 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/48920 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/
#2: Initial revision
Your brain is convinced it's done with the first draft, which means it's time to start the second draft on the story cleaning up everything and filling up any missing details as needed. Which is a new task and one that you have to do regardless of how complete the first draft is. Yours just happens to be pretty barebones in the second half, but that's ok, each pass you make the novel more complete until it really is.