Use as much free online marketing as you can with the free time you have. Using traffic exchanges while sometimes boring can potentially bring you new signups with no cost to you. The key is to promote everyday regardless of how you are doing. Use other programs that allow links etc to showcase your gdi link and use such things as webdecals.com and tshirts to display your site anywhere you are , afterall whatever logo is on your clothing isnt helping you make money and sitting in traffic might as well give you a chance to pay for some of that outrageous gas .