Two ways to launch a new project.
You can set a group of people a hard goal and ask them to work towards it.
You reveal a project you’ve been working on for a long time and ask for people to help.
The problem is only 1% of people tend to help create a project compared with 10% that tend to edit. Almost every successful collective effort requires an individual (or a few individuals) to make a huge number of contributions to get started.