Nice vase save.
The horn is spetacular.
The brass lead combo is looking good.
The steel is too hard to be able to do much with a regular file. You can use diamond files or wet dry wrapped around a round or roundish piece of wood. It is a lot of work to do file work on hardened steel, even with diamonds. I’d leave it. Perhaps you might like to experiment on a dead blade. Dead blades are always handy for stuff like that. I never toss the ones that are beyond repair, they still have learning value.