When I first viewed this on my phone, I agreed with John, but after viewing on my monitor, I can see there is contrast there, it's more a case of everything being the same color. The trees, the track, the concrete, the sky, there just isn't much tonal variation.
I'm taking a guess here, but I'm assuming your weather is similar to ours of the last few days, cloudy and overcast. That by itself will cause a landscape to lack much dynamic range. Best way to avoid that is shoot during the golden hours or wait for a better day. If it can't be avoided then bring the image into PS, and adjust the black point and white point with Levels. Add a contrast layer and adjust for a nice RGB S curve.