What I'm about to say seems strange, but please don't try to finish the game if your original idea didn't come to fruition, nothing makes me sadder than a rushed ending.
If you want to stop the project, then stop and spend some time without updating the game for 1 or 2 years, keep talking to the community, if the community continues to grow and support you, come back to the project reinvigorated, otherwise stop the game like this unfinished jewel that you are today, instead of destroying all your hard work with rushed development.
Maybe over time more people will appear willing to support you.