Joanne, I would communicate with your Realtor what your expectations are, usually lack of communication is the problem. In my experience ,Typically the reasons a home gets little or no attention are: 1. over priced
2. condition of home (doesn't show well, cluttered, in disrepair, odors,lack of curb appeal etc.)
3.location of home: it's not in a desireable part of town, is in a depreciating part of town, neighbors have junk in thier yards, there are un correctable challenges like too close to a train track, a busy hwy or frwy, an electrical tower, yard is sloped, etc.
Once it is on the MLS/internet and there is a visible yard sign - agents and buyers (who drive around looking in the areas they want to live in) will be able to find it. Perhaps in this correcting market you have unreal expectations. I'd get with your Realtor and review the current trend analysis and absorption rates for your area, and perhaps adjust your game plan. Realtors don't control the market 'results' and out come, we service it and our clients. You may also want to get together with your realtor and tour/preview the other homes in your area (your competition) just for comparison.
as far as the open house, I put my yard sign out early in the week for a Sunday open house, then on Sunday I put my pointer signs out an hour before ( also because our local codes doesnt allow pointer signs) and being a Weichert agent- our Open House systems totally rock (we put 8 yellow pointer signs and 2 yellow balloons on each sign- all around the area leading to the house- people cant miss it!) We make an event out of it. Doesn't always garantee people will come, but it raises the odds!
Hope you find this helpful. Your listing agreement should outline what your options are. If you are not sure, call the Broker and meet with He/she and your agent to get back on track. I'm sure they will want you to feel like you are being well served. Good luck!