You indicate that the "case is still open", which will be taken to mean the child endangerment complaint. If that is the case, then you can't "do" anything, if at all, until the CPS investigation is closed without action, dismissed or otherwise ended - any which way but must be in your favor. After that, consult an attorney to see if all of their conduct as a whole might serve as a basis for an "intentional infliction of emotional distress" claim, a "prima facie tort" claim, or other theory of recovery. Tread lightly until CPS decides to close the case.
I've seen this fact patter in Florida, but not in New York. Unfortunately for folks in your position, I don't think there is much you can do. The system is set up so that people will not be afraid to report real child endangerment, so reporters are insulated from liability for reporting. I would be surprised if the law is different on this issue in NY. Maybe it's time to think about moving. By moving, your crazy neighbors won't be "winning," YOU will be, because you will no longer be living near them. Good luck.
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If and when the CPS investigation is reported as "unfounded," then you should pursue the matter in civil court if your attorney has determined it is a suit worth bringing. You may wish to await the result of a misdemeanor prosecution, if it ever takes place, but your statute of limitation will continue to run, as it is only one year, and this misdemeanor will not extend it even if there were a criminal conviction obtained.
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There are some very evil people in the world and they are aware that CPS must investigate any complaint. They will use this to punish their enemies and CPS knows this. You will not get anywhere with a malicious prosecution case or smalls claims court unless you had absolute proof. A lawyer will not take such cases as there is no monetary reward to justify the many hours to prepare the case so you will have to deal with these people. Either make friends with them, move, or get even in a lawful way, like playing really bad music.