What has your realtor done to market your place. It hurts when sellers drop a realtor who has done a lot of things for them, only to have the seller re-list at the reduced price that the previous realtor recommended...and then the property sells!
Review the things that your realtor has done for you --- and how does that compare with what other realtors can do? Are you aware of every marketing tools your realtor has used? Sometimes, sellers have no idea what it takes to promote a property: photos, visual tours, online advertising on several websites, enhanced listing description on Realtor.com, vflyer/postlets, craigslist, open houses, brokers tours, postcards and other mailers, etc.
What is the current market condition in your area, and how is your property priced compared to the recent sales, current and pending listings? How does your property look? Is it a fixer, or is it in good condition? Does it show well? How about curb appeal?
Price is the single most important factor in selling. Remember, it's not always what you as the seller thinks your property is worth, but what a qualified buyer thinks it's worth and is willing to pay for it.