This is really turning into a project!! I like how your PP intensified the colors of the field but the harvesting machine is still lacking in definition and the sky is too blue, especially since it was originally grey. I did another tweak using a preset as a base and found that it brought out more detail on the machine and gave a slight bit of character to that blah grey sky. Of course, the easy out of this problem was to simply convert to sepia which gives the image an authentic old timey feel!

There is a lot of interest for me with the sepia toned, except that it ends up in a narrow tonal range, same as the original.

I did a couple of quick selective tweaks with an online app I use with my Chromebook. Just to give you some ideas, and including cropping out most of the sky

If you have the patience, you can lighten around the farm implement carefully and darken + sharpen it selectively to bring out more details.