Steel burrs

I resharpen carbide and steel burrs at .50 each. Most of my
customers say my resharpened burrs work better than new ones. I even
have one customer that sends me new burrs to sharpen because he likes
the work i do on theim. How would i go about getting the word out. I
have been doing this for about 25 years. I have alot of local
bussiness, but seem to have a hard time expanding the bussines. Joe