We did this many years ago and we won first place in Florida!! We were on the second floor as well with about as much space

I would suggest getting some heavy duty wire and make something out of it and then wrap lights around it, and put in that bare spot on the left by the door and the corner of building. I had made a star and an angel. Hang lights from the ceiling of your balcony, and find some cheap ornaments to hang down from the ceiling as well. If you have any old garland that you do not use anymore or is on its last leg, that is always good to hang out too. I waited until I knew they were out and about judging and I had Christmas music playing outside when they walked by too. Maybe something on the sliding glass doors too. I am not sure if I still have pictures of it or not, if I can find them, I will try to post.