What kind of contribution that you are looking for? You did not specify any. People can contribute anything voluntarily if they believe and perceive some project has potency. Speaking about the title of this thread, you can not boast your own project as good, people will decide. Saying your own project is a good project would rather make it perceived your project as subpar.

An early stage project requires a tremendous effort to gather the masses' attention, if you truly build something worthwhile, you should focus on the utilities or use cases of the project, not merely looking for attention.