I also made the decision to go 100% freelance at the start of the year, albeit in a different industry from yourself, so I can understand your frustration. I disagree with the people telling you it’s a big mistake to leave your job, but I can understand their concerns. In the end, the decision is yours and it’s really up to you whether or not this works out for you.
The first thing I’d suggest is improving your profile, gig and descriptions because, to me, they just sound like a hobbyist offering to do casual work. Nothing wrong with that, of course, but if you want to actually grow your brand and get more orders then you’ll need to put across a much more professional, confidence-inspiring image. At the moment, I can see a variety of errors and badly chosen words that will put buyers off; especially professional companies and those looking for a high-end product.
Secondly, your examples look amateurish. Sorry to be blunt about it, but it’s true. They look like a high school graphic design project. I’m not saying I could do any better or just being rude for the sake of it, but I don’t think they represent your skills well enough to attract a buyer.
Another issue is the fact that you openly describe your skills in Photoshop as being a hobby. Very few buyers will want to spend money on someone’s hobby project, so you might want to think more about your skills with the software you use.
I don’t think you’re entirely wrong to have quit your job to pursue your passion, but I do think that you need to work on your presentation, your phrasing and your general sales copy so that buyers will be more likely to purchase your services.
Another thing to add is this: Have multiple streams of income.
Don’t just focus on your graphic design for logo’s etc. You could offer separate services doing stuff like business cards, invitations, and all sorts of creative work that you’ll enjoy and profit from. You could also use your skills from your media studies degree to earn money. Offer up services to buyers that’ll allow you to utilize your skills in all areas, and don’t just limit yourself to doing graphic design.
Good luck with everything and I hope you get that first order soon!