Hi Trevor, you have had some great suggestions offered. Here are some I don't think were mentioned.
I see two prominent objects competing for attention. So what are the attention getters in this image?
What I notice is the following:
Detail. Both structures a well detailed.
Size. Both structures are relatively large and prominent in the image.
Colour. Both structures had identical colouring.
Shape. Both structures have similar shapes.
There are a number of ways to get one building to complement the other, rather then compete for the viewer's attention.
What if you used a shallow DoF on the house and let the barn recent into the background by being less sharp?
What if you used a wider angle lens so that the barn was more distant and the house was significantly more prominent than the barn?
What if you were to shoot a bit more from the left to give more separation of the two?
What if you only part of the barn was in the image?
Artistically, an odd number of similar objects works better then an even number. What if, due to the shooting angle, the barn wasn't in the image?
Hopefully this will give you some options to consider.