I'm not sure what you mean by repeated leveling, but some older varieties of roses aren't known for being big bloomers. Also, if the rose was originally a grafted variety the top flowering portion of the plant may have died a long time ago and what you are seeing is the wild growth coming up from the root stock. That root stock generally never blooms or only blooms sporadically. It really depends on what kind of rose this is. Also, roses need full sun so if it's in the shade it could prohibit new flowers. I just don't know without some knowledge of the variety of the rose you have, but I bet you have a rose growing from an old root stock. If that's the case, you should dig it up and buy a new rose."