lawsuit between homeowners has been going on for over 4 years what can I do to end this

lawsuit between homeowners: In late 2004 I was sued by the guy next door aleging that the construction of my house and landscaping caused water to get into his basement. I turned the case over to my homeowners insurance who in turn hired an attorney for me. Things started out fine. He got an expert over to look it over etc. but things then died in the water. We almost went to trial in April 2007 but there was supposedly a settlement that the attorneys never followed up on. I retired over 3 years ago and would have liked to have sold this house then. Until recently I have always called wondering what the status of the case is. A year ago, trying to get some action on the 04/2007 settlement, the answer I got was "I can't move mountains" at that point I lost all faith in my attorney. In the current home market, I have lost over $100,000 value in the lome I need to sell. Because I can't sell I have to continue working in my retirement. What can I do? I feel let down by the system.