How to Get Revolutionary War Ancestor Recognition

I have a Revolutionary War Ancestor who is buried in a small private plot on the side of a field. Although there is a (fallen) stone, his grave isn't marked with a war marker. Does anyone have any suggestions as to how I can do the following:

1. Repair the 2 or 3 stones in this small private cemetery; or

2. Ensure that the grave receives a proper Revolutionary War marker? This will undoubtedly require proving that the individual (Nicholas Weiser, sometimes Viser or Weser) was in the Revolutionary War. I've found some evidence, but I would appreciate any suggestions for how to go about this process.

It is important to me that Nicholas receive proper recognition for his efforts in the War. Thank you for your time!