You can contribute via the GitHub repository.
There are several tasks you can complete ranging from creating beautiful art, code, music, and more! If you see a way you can move the project forward with us, join in.
Another way you can contribute to this project is through funding. And if there's something specific that we are already working on and you'd like us to give it some more focus, you can emphasize that by voicing your concern. Currently we're deciding the best platform to accept funding long-term. Currently we're thinking of Open Collective. But that may change depending on some factors; fees being one of them.