Every day when you wake up and you have prepared your cup of coffee, instead of checking emails or so.
Pick a project on github and try spent 30 minutes trying to do a small contribution to the open source community.
I know 30 minutes it's not enough, yeah if there is a huge or big stuff to do it's hard to tackle in 30 minutes, but a thing it's compound of small pieces. so Start Simple.
To contribute to the Open Source you don't need to add a feature to Ruby core, could be a fix a typo, fix a bug, translate some locales, there are many ways to contribute. Don't forget about it.
Boy Scouts rule: "Always leave the campground cleaner than you found it"