A great way to get more work is to ask those that you done work for is to give you a referral. Chances are they may know someone else who needs some writing work done. I have gotten a job or two this way. These don`t always work out, as your work may not be what they are looking for, but when you don`t have to advertise yourself, or pay a fee for the job, they can be great.
I read an interesting idea on a forum from one writer to help get more referrals. She offers her clients a 10% referral fee. I don`t know the details on this, but if you are looking for work and are interested in doing something like this, you could easily make up your own terms.