Hey you could totally keep the green hue as grey is neutral & goes petty much with every colour.

However if you have strong inclinations towards any other colour, you are the boss :)

I don't think the grey and green are terrible, I think you just need to make sure there are enough other punches of contrast in the room so it doesn't all murk together. (Murk is a verb right?!)

I guess i’m tired of the green even though I love it. What do you mean by adding another punch of color ? I have yellow accents but something is just not coming together!

Here’s another photo.

With open color

I'd select a gray that matches your sofa.

I would also stain the stone to soften the appearance like you see below.

If windows or few or room is very deep, it might help to keep the back wall of room, away from windows a lighter brighter colour to reflect more light.

Alternatively, keep just one accent wall the green & paint the rest same white as other walls.

I like the shade of green currently, as it is just that shade not too bright not too dull, calm & modern looking. Just what's needed in a lake house..

If you want to make it more contemperary you could make all white maybe or very light neutrals as suggested above.

Actually like how the yellow cushions are popping out in front of those green walls.

I think your wall color is great. You just need to replace that throw.

I like the green, even though green is my least favorite color. It does go well with your house. Try a few turquioise accessories with it, and give it a bit of color.