noise

There are a lot of places I would like to fly but the 3dr solo is just too loud to do it without feeling like I am annoying people trying to enjoy the outdoors. I want to be as respectful as possible. I was flying over a frozen lake yesterday and I could hear the thing making its screechy noise...

Does anyone have a suggestion to reduce the noise of the Solo? I was able to replace the blades on my DJI with stiffer blades and it seemed to reduce the noise factor.