What usually works for me:

- find a single interesting subject (usually a tree)

- get close (3-5 metres away), directly facing or from a lower ground upwards

- use wide to mid range lens, open the aperture wider than usual for landscapes for softer look (f4-6.3 instead of f8-11)

- let the fog do the rest, separating your subject from everything else

- try different approaches to the postproduction - maybe B&W or desaturated colors