I think that these are 7 very helpful guides to use as a Freelancer and a Graphic Designer seeking work. I know I already use at least 5 of the ways listed and they have really paid off.
I plan to use the other two methods as well. The digital portfolio is really important and a blog post could certainly attract attention.
Pro Bono work might start a few people just wanting you to work for free. In any case if it is a reputable company or charity it could lead to more paid assignments or land a permanent gig.