If you want that empty wall to be functional, you can install hanging shelves that can serve as a storage area for your stuff. That should help maximize your space, especially if you are living in a tiny apartment. You can also put some displays on them.
With this one here, you may need some help. It’s going to be worth it, though, because a shelf wall will definitely cover that large wall. Plus, it will give you more storage space. You can even design it in such a way that you can push your couch against the wall.
See, there are many affordable ideas for large wall decor. All you need to do is to pick one that suits your taste. You won’t have to stare at a large, empty wall anymore!