There are no rules as to how you apply your post processing to this image; but, please let us know what you have done so we can all learn. If you would like to post a candidate image next week, please ensure it is of sufficiently high resolution for manipulation by the participants (3000px on the long side, 300dpi for example). Most of all, let's have fun while we are learning or demonstrating how we use our post-processing software, imaginations and interpretations. Somewhere in Austria.
All work done in PSE2020. Version the first....... Cropped left and top. Used impressionist brush to add brilliance. Finished using paint daubs filter to give image an abstract look.
Duplicated right half of top part of image, reversed it, then pasted on left top half. Blended with original image. Then used Topaz Simplify painting settings and "tonal contrast" in NIK color EFEX. Menacing (or friendly?) island in background was unexpected.
Photoshop: Crop; ACR Filter (dehaze); Add clouds; S-Curve on near mountains; Green boost via curves; Topaz DeNoise AI; Blur mountain-sky boundary.
Attempt at a miniature effect with DXO. For me these wee things are always hit-or-miss, usually miss.