How about a dark gray for the siding. Raccoon Fur by Benjamin Moore looks pretty.

Two concepts you might want to consider: First, look for a neutral that matches your stone, maybe the midtone one. An example would be BM Rockport Gray (but you will need to get samples, don't rely on what I can see on my monitor.) https://www.benjaminmoore.com/en-us/paint-colors/color/hc-105/rockport-gray

Then do the trim in the lightest color from the stone. You'll have a look something like this except for the dark trim: https://www.houzz.com/photos/waterside-paradise-craftsman-exterior-phvw-vp~58966982

Second, you may want to lean into the sage green in your stone (I've been accused of seeing green in anything) and go with a sage color for your house. That would also look great against the brick. Some good examples here: https://www.brickandbatten.com/green-exterior-house-colors/

Eldorado Stone 2017 · More Info

Don't know the name of this, but a warm cream would be nice with the roof.

Green Dream House · More Info

Transitional Exterior · More Info

A little more on the taupe than cream side:

Front elevation · More Info

Too bad your stonework doesn’t go well with the roof. (And neither matches the brick.) Remember that next time you get a new roof.

Nonetheless, I also would pick something that goes well with the stone, something understated I think. Definitely paint over the red trim in a very pale tone so it doesn’t jump out.