Ask HN: What should I do now to find my next project?

Bit of background about me:

I'm 22. Over the past year I built a small Internet business that is making about $20k/month. The business is basically fully automated now.

My dream is to build a great consumer tech company, something like Google, Facebook or Reddit. I'm not interested in building B2B businesses. I'm interested in building something that a lot of people use.

This means I have:

  - lots of free time
  - no need to worry about money
  - some money to put into my next project
  - enough programming skills to build any website or mobile app

What I don't have:

  - Good connections for co-founders or investors (I'm a bit anti-social)
  - US passport (I'm Canadian, but I want to move to US)
  - Not much deep expertise in any leading technology

I've been quite frustrated recently. I finished building a new project that is not working right now, and I'm not really motivated to work on it anymore. I feel somewhat disconnected from building something "big".

I realized that instead of jumping head-first into a new project, it may be worth taking the time to explore some things. However, "exploring" feels bad because I feel lost and purposeless. I realized that I'm the happiest when I'm working on some great project. Ironically, "work" isn't really work for me. I feel sad when I'm taking time off. My dream life would be to work 12 hours a day, every day, building a great company.

As I'm writing this, I feel pretty bad. I woke up this morning and didn't do anything "productive"; just reading and playing some games. I really want to work on something great but I have no idea how I'm supposed to find the next thing to work on.

If you were me, what would you do?