The first thing I do is always resize the image, this would either be for a blog or social media there for 4000 pixels is way too large so I half it.
This makes the image a more manageable size and also helps Photoshop run faster as it doesn't have so much data to deal with. Next I edit the Hue/ Saturation, I like my images to be fairly vibrant so I up the saturation but don't touch anything else. (the short cut on a Mac is command U)
I then go in by hand to add more to the areas I want. For this image I sharpened the edges of the mountain
Below is a side by side view of the before and after.
Much improved i'd say, and it only took 10 minutes. Do you use any of the same methods as me?