What skill(s) did you learn in your 30s or 40s that altered your career path?

I wrote an answer to this question in my Quora post.

You can find it here https://www.quora.com/What-skill-s-did-you-learn-in-your-30s-or-40s-that-altered-your-career-path/answer/Alket-Cecaj

My post there was synthetic. In my case, I learned statistics, data mining, and coding.

But what about yourself? What did you learn in your 30s or 40s that helped you switch career for better?