Consider buying a refillable pen and using ink that is a different color from the disposable pens that most people use. Because your writing will look different than everyone else's, you can subtly remind people of what you've done without needing to put your name on it. Owning a color is a strong form of branding. While you don't need to go as far as owning Tiffany blue, it'll help you to stand out.
Fortunately, this is easy to do. Go to an art supply store and buy a bottle of calligraphy ink. It's a small fee to pay to increase the likelihood of people noticing your work. Since over time people will start to associate you with the color you choose, be sure that you like it. Remember that this'll only work if you stick to the same one.