Where are the finishing lines for your project?
Some projects get finished up and wrapped up neatly, others (often work serving people, like education or government) are by nature never finished.
If your project has no clear finish line, it’s worth considering making an artificial one. It could be after a defined length of time or based on contribution: after you’ve achieved a certain goal, had a defined impact… or if something doesn’t happen by a certain timeframe.
Your cause will rumble on (many of our best causes will do so for as long as there are people), but it’s naive (and unhelpful) to think that your project will last forever, at least in its current form.