So what do these guys have in common and where am I going with this do I hear you ask? Well you see, both photographers started this merely as a personal project, with no real expectations. They were just putting in the effort and doing what they love. And look where it has landed (pun once again intended) them.
Personal projects can be extremely rewarding. Even if you don't reach the fame or exposure that these guys did, you will still receive the satisfaction of creating something that is uniquely yours and will most likely improve your craft by learning a thing or two along the way. It's a win-win.
My advice is to start creating today. Anything. It doesn't have to be amazing. It just has to be something. And if you can't think of anything, just wing it (ok, I'll stop now)...
Need more convincing? Check out this video on the topic by froknowsphoto.