Writing has always been an important part of me. I never did it for money, but purely out of joy and passion to share my lessons learned with others. I've been writing on my blog for over 10 years about a variety of topics, growing it from 10 visitors a day to a million visitors a year.
Expose yourself, get feedback, improve. The best way to learn and deeply understand things is by explaining them to others, in whatever form you like.