How can I get writing gigs?
Getting writing gigs can be quite difficult for newbies. Specially when one was originally attached to a writing company, which made it much easier to get writing jobs despite the low pay. Aside from the sound advice @Major provided above, I want to add that another suggestion as to how you can self promote and increase your chances of getting new clients.
Use your existing network of university students from your alma mater. Make sure to let the undergrads know that in spite of your being a graduate, you are more than willing to help them out with their academic needs "for the right price". Since these students already know you and the quality of your writing / work, it won't be difficult for you to earn their trust as an independent writer. Now, make sure to deliver impeccable work so that the same students can help you with word of mouth promotions. The rest of the writing gig stuff should come easy.