It's a big job but somebody has to do it. Or you could let the rumor mill do it for you. You should have made that announcement. It avoids pleading. If you're not number one, at least be number two.
Nothing makes the old ones work harder.
The good ones show their appreciation by selling more. You would be amazed how it gets changed with the telling. Which lowers the cost of selling. Before they become obsolete. That way you're the first one they call when they change suppliers.