this was a fun one for whatever reason
so my process darktable I did base curve adjustment and nothing else
the curve was just straight but pulled back on the top half way back to the left and in a bit on bottom to the right
mainly fiting the color space into the output without blowing anything or loosing
then working with the exported png in gimp first I did curve based color adjustment on RGB leaving value
then dup twice and set first to overlay 50% and transparency
2nd copy run c2g with 16 samples then set layer to overlay also
hide the c2g do new visible layer and desaturate with luminosity copy visible and hide
unhide c2g layer and add the copied layer as the mask
set to c2g layer at 50% transparency
(yes idea borrowed from: How to realistically brighten shadows in GIMP - Mantiuk and Retinex in G'MIC )
add new visible layer, run gmic items local contrast enhance
adding another layer with 50% gmic sharpen texture helps with details (attached picture is missing this)
if you end up with colors a bit off on the forest on the left say a bit yellow redo initial RGB curves and reduce the blue reduction