First of all you need to be priced correctly.This can be difficult and will require the assistance of an experienced Realtor or an Appraiser. Base your price on the comparable "solds" not currently "active" listings. Many active listings will NEVER sell and are priced incorrectly, so don't make this common error. Your best bet is find a Realtor with a track record in raw land sales who has local knowledge and also national marketing power to get you exposure to buyers who will be relocating to your area. Ask them to document their land sales experience and don't hesitate to ask them for references from past and current clients. You may need to consider increasing the amount of commissions offered to the Realtor bringing in the Buyer (Buyer's Agent) to make your offering the most attractive for them to show. In our market this would mean moving from a 6% to a 7% gross commission; with 4% offered to the Selling Side. Realtors receive no pay until transactions close and like any business person Realtors are appreciative of increased pay for their services.
Finally, be sure that your land is properly SIGNED and visibly for sale. Keep it trimmed, mowed, bush-hogged and free of brush, trash, and debris with fence rows clear. If it looks like it has little value to you then it will have little value to potential Buyers. Along with signage be sure that you have a committment from your Realtor to advertise your listing. Land sales bring in smaller commission amounts and some will cut corners by not advertising land.