A repo on GitHub I'm maintaining has grown with 200k downloads / month since I started working on it a year ago. My recipe? I added an npm badge in the readme showing downloads / month and I responded to every issue and reviewed every PR. Now there's so much issues and PRs coming in that we had to add an extra maintainer, feels great! Teamwork, fuck yeah!

Not every PR got merged of course, but every single one of them got reviewed. Just being a good and friendly developer, giving back to the community that has given me so much. Some tips for you maintainers out there. If you have a popular project and no time there's always someone else who's willing to spend time on it, ask around and you will surely find someone else.