Master the light.
Hopefully by now you are familiar with the golden hour and shooting the hour before and after sunset & sunrise. This is solid advise and is still when I do most of my landscape photography. But this only gives you about two hours of each day that you can shoot, so learning how to make best use of the remaining twenty two hours can really open up a ton of options. Getting into astro photography opens up the night and long exposure photography during the day can really help turn a harsh blue sky day into a dynamic scene.
Love the raining days.
This is slightly related to the above tip but I feel it needs its own section based on how often I am out shooting when no one else is. Overcast days and distant impending raining all make for some of my favourite content. Yes it won't give you the chocolate box images that you may be after, but it will create far more drama in your landscapes once you can master it and removes all those harsh shadows that can ruin your shots.
Right lens for the job.
This tip can be best be mastered by doing one simple task a few times around the home. Hopefully you have a few lenses to choose from but even if all you have is the standard 18-55mm lens this will work. Find a smallish object like a apple or a coffee cup and place it on the end of your dining table or even out in your driveway. Then using the widest lens you have, take a photo of the object making sure your object is just touching the top and bottom of the shot (if possible). Then without moving the object but instead using your lens with as much zoom as possible take the same photo. Making sure to keep the object touching the top and bottom of the shot. Once you have both photos look at how the different lens effect the subject and its background. Now move the object around the house to different locations with different backgrounds taking the same two photos.
This might sound like a odd task to do but think of it like the karate kids wax on, wax off. Next time you are out shooting landscapes find your self a neat little object for a foreground. This can be just a interesting rock or maybe a puddle with a good reflection in it. But now you will know which lens to use and where to stand to adjust your backgrounds and subjects to help compose your shot perfectly.