Need help with trashy neighbors?

I live in a subdivision called Oakwood in Tennessee.When we purchased our home we were told of the rules set by the developer.At that time we didn’t have any problems with the subdivision it was in neat apperence.In the last few years the developer sold more lots to others that are not abiding by the set rules even the developer does not abide by his on rules.When we ask him for his help in getting the neighbors to clean up the subdivision,he just plays it off and tells us that he can’t do anything to help.I now live in what feels like the new county dump and no one seems to care but me.I don’t know what to do to get help with this matter.I am hoping to sell and move but when buyers see the dump this place has become they never return.If you can help me with this issue and developer please let me know my next move.Thank you for any advice.