Sometimes, the best opportunities out there come by word of mouth. You go out and you talk to people and they find out what you are good at and you find out that they have to offer and then those opportunities present themselves.
That means for introverts that you need to get out of the house occasionally and talk to people. I know for some of you that sounds very scary but it is necessary and you might even learn something.
So, get out of the house and go and meet people, you never know what is going to happen.