There is a haze removal module in DT which can be handy.
With masks I often use a drawn paths mask and blur and feather the edges to get an invisible transition. There is also a nice gradient mask and even parametric masks. The mask in DT are what made me choose DT over other programs such as RawTherapee, Lightroom etc. The user guide is worth bookmarking and using for information about masks and other issues darktable 4.6 user manual - darktable
Started from your xmp and then just started experimenting…landed here after a few tweaks… with all this color you could take this image in a few ways… cold and dark or bit warmer …the green could be tweaked to match reality or vision as could the sky…
P1010119.ORF.xmp (14.7 KB)
Nice location… can I ask where it is? Ignore the question if you prefer 
My fairly quick version using the latest windows weekly build of 4.1 i.e. what will be 4.2.
Used sigmoid instead of filmic.
Yes it is. This was in the White Mountains in New Hampshire.
quick vkdt edit:
used a few brush strokes to mask the mountain, put an exposure (+0.9ev) and an ACES CDL colour grading node on the mask branch of the graph (to give the blueish cloud shadow the same tint as the rest of the mountain). the mask is blurred by a guided filter (it’s the default draw block i inserted).
the rest is default processing (left a bit of noise in there and didn’t do anything about sharpness or extra drama in the clouds).
config file:
P1010119.ORF.cfg (19.2 KB)
My contribution…
two separate tone equalizers (sky and landscape), a bit of masked dehazing, and colors by taste via channel mixer.
In theses landscape shots I find myself often slicing the image with masks into different layers by distance, a bit elaborate, but gives finer control 
The detailed structures in the trees can sometimes be optimized with the demosaicing algorithm.
Postcard! 
@Jesse_Cambon I haven’t understood what you were trying to obtain from the edit of your photo. To me it looks very good as it is. I love the depth of field guiding your eye in traversing kilometers of a green landscape, I love the contrast in the clouds and that impertinent shadow obscuring the top of the nearest hill (I’m captured by that holy shadow).
The trees are a little out of focus/blurred (a firm hand or a tripod could have helped, but who uses a tripod nowadays? I don’t), but not too much. You wouldn’t notice online at a standard magnification and probably it would be OK also in print.
I don’t like ‘Local contrast’ module in Darktable, I don’t even understand why that module is included in the list of all presets. It’s great for “local” contrast edits, but it ruins most of the real life photos making them look flat. It erases the overall lighting atmosphere, gradients and nuances that express the three dimensions of light and shadow.
In Darktable I also would stay away from ‘Haze removal’ module: if I take a shot of a scene where haze is there, probably I was pushed to shot that scene mainly because the haze was there in the first place, so it would be stupid by me to remove it ex-post. But there are always exceptions, and your shot is one of these. Haze removal works here.
Having said that… Congratulation for the nice photograph and thank you for the opportunity you gave us to play&learn with it.
My interpretation is something basic. In DT 4.2, I used Sigmoid (that I think you don’t have in DT 4.0), Haze removal and more than one instance of Diffuse or Sharpen (to sharpen the trees). The master photo was already more than OK from my point of view!
EDIT: minor edits due to a different native language.
@LukeDrake Thanks! I agree - as I have used darktable more I have grown to appreciate using multiple instances of diffuse and sharpen (such as in the dehaze and local contrast presets). I then adjust the number of iterations depending on how much sharpening and contrast I want. This tends to be less heavy handed than the local contrast module, as you note.
One downside is that diffuse and sharpen appears to be pretty computationally intensive, particularly if you turn up the number of iterations, but this normally hasn’t been too big an issue for me.
I crop the image to 16:9 and emphasize the sky. I also give a greenish hue to the whole photograph.
Thank you by sharing
