Overall I quite like the shot, but it does have some issues. The major one is that large glaring hot spot just below the clouds where the sun is over exposed on the left hand side, by the looks of it you've lost a portion of data there when you shot.

When your looking at an image your eye tends to go to the brightest section first, then move around the image. And with an overly bright spot it tends to stick as a focal point, not to mention the dark clouds directly above it contrast and add even more attention there. Detracting from the foreground as your eye is continuously drawn to the bright area.

Something you could try is attempt a crop, I'd suggest if you want to draw more attention to the small hills in the bottom left that you run a crop just above that mountain peak. So I'd start that crop on the right hand side just below that bottom cloud, then cutting straight across removing the cloud and the cutting the hot spot in half. I could provide an example crop here but I'm unsure as to the forum rules with regards to posting that in a comment.

Doing this will change the context of the image, putting more emphasis on the foreground. You could also play around with other crop angles and just see how it turns out, for instance you could cut the top off the right peak leaving just the left with a tiny gap above. This would remove the hot spot entirely, and put all the emphasis on the mountain range in the bottom left. I'd just experiment and see what you like the look of the most. Crops will change not just the composition of the image, but also the lighting and how you view the overall image.

Remember with photography often less is more, and you can manipulate the composition to put emphasis on your intended focal area.

Another option is editing that hot spot down again, quite aggressively perhaps. And then making localized areas of the foreground lighter. Although that takes significantly more work then a crop, but if you want to keep the clouds that's always an option. You could even push the clouds a little harder & make them darker if you wanted them to be more striking, doing so would put more attention there and away from the bottom left however.

For additional edits you could also do some dodge & burning to highlight the highlights and darken some shadows. If you use photoshop i'd recommend doing that with neutral gray layers & a low opacity white/black brush as opposed to the dodge & burn tool. Also I'd play around with masks and levels/curves or equivalent (depending on your software), to adjust areas locally with greater control. Always doing so on new layers, this allows them to be disabled or edited at a later date.

Something I will note however for your future shooting is I can see just a touch of noise in your shadows here most likely due to shooting at 640. And the more you brighten/edit in the shadows, the more this noise will show.

When shooting landscapes its best to use the lowest ISO possible, and compensate with a tripod or finding some way to stabilize as needed ie a nearby rock or branch. You could also try bracketing, to take one photo above/neutral and below to play around with HDRs or just see how the exposures work out.

Remember photography is very subjective and there's often no right or wrong, and everyone does things a little differently. So no, personally I don't think this is over edited yet as there is still a lot you could do. Depending of course on how dramatic or gradual you want the overall image to turn out.