The Last 10% of any project is the hardest and takes the longest – mentally – of the entire project.
I don’t know how long it will take you or what it takes to complete it.
Only you do, all I know is the last 10% can take twice as long as the middle 80% and thrice of the starting 10%.
The solution?
Find a closer, someone who can take that last 10% over the finish line. They are in short supply, but when you have one, they will make every project succeed by finishing that last 10% that the team can’t get to.
Maybe they’ll take the largest bug pile.
Or maybe they’ll keep the mood up.
Or maybe they’ll slice and dice what is in or out.
Whatever it is, get them, finish your project, and move on to the next one.