Industrious people are productive, but even with success, they often underestimate their abilities. They've taken risks, worked hard and become good managers. Most have one thing in common; they could have been successful doing something else.
Whether you desire to be an active or passive investor will depend on present obligations.

I would suggest investing in many different markets. Doesn't have to be much. A little here, a little there. What it will do is force you to follow along, and as you do you'll learn things that noone can teach. And then will come the fun of building on your own skills - much as you've already done. It's always fun and never gets old.