I would recommend making a Blog for safe measure! You can technically write or advertise nearly anything (be off-topic or personal) with a blog, so when it comes to promoting a Studio of your own that isn't being noticed much, the blog section is always your best pick as those still appear on the front page of GB for people to see!
If you don't yet have it, remember it costs 1,000 points to unlock.
You can create a Position Available, to get people of specific talents to join and help you. You can also promote your studio by simply being active - when you add a studio submission or post in your studio messages area it will bump your studio to the top of the studios list.