Depending on the project more thorough docs are also a great way to go IMO. In order for someone to collaborate effectively they will need to easily understand how it works first.
Other than that I personally would write about it, share it and spread the word so people are able to find it online.
Good luck with your project if you have one in mind already!
A good README is a great way to start. There are lots of resources out there but I remember this post from the GitHub org from last Hacktoberfest:
How to Create the Perfect README for Your Open Source Project
Rizèl Scarlett for GitHub ・ Nov 2 '21
Depending on the project more thorough docs are also a great way to go IMO. In order for someone to collaborate effectively they will need to easily understand how it works first.
Other than that I personally would write about it, share it and spread the word so people are able to find it online.
Good luck with your project if you have one in mind already!
Thanks for your advice Fernando. Yes, I have one in mind already, and I’ll share about it once I start working on it.