Don't stop learning shit. Literally ever. If you aren't learning, you need to be digesting fresh knowledge and thinking about how it all interacts. It's not linear, it's exponential. The more you know, the more you get out of new information.

For instance, if you know how synthesizers work, you know 90% of how a radio works. You know those two things, and are shown how those principals apply also to physical vibrations and light, you now know 90% of how most instruments work, add knowledge of diffraction and now you know how rainbows work, most of how how a camera works, etc etc.