Enjoy your stable systems while you can! Learning comes through solving problems as they come up. It’s a good sign if you don’t have to.

Need some new functionality? Figure out how to set it up. Encounter a bug or issue? Troubleshoot and fix it. Functionality that you want doesn’t exist? Time to program it yourself.

You can also start customizing (ricing) your system as you wish. Take a look at unixporn style communities for inspiration and advice.