The last 10% are 90% of the work.
This is usually why going the MVP route is healthier. :)
With a bit of luck you just lost your motivation.
The alternative is that you learned something while making this that changed your mind about the project.
Consider going back and retrospecting your original motivation,
what was it that got you going, what have you learned, and how does that change things?
+1 for this. I find retrospectives incredibly valuable for keeping my mental health in check.
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