If it's almost done, finish it. Otherwise anticipate moving onto a new project and 6 months from now writing the same Ask HN post again as the excitement of the

If it's almost done, finish it. Otherwise anticipate moving onto a new project and 6 months from now writing the same Ask HN post again as the excitement of the new project wears off and you find yourself dreading having to grind out that last 20%. Don't use "lost steam" as an excuse for the fear of uncertainty as to what comes next after you launch. Good luck.