Follow these three tips for things you can do today to retain and grow business from your existing clients.

1. Market to your existing clients. Your current customers are already doing business with you and are more likely to buy from you again. Focus most of your time, efforts, and resources on better serving your current clients. Go deeper instead of wider.

2. Be consistent in your approach and interactions. Treat your clients with honesty, humor, and respect -- and maintain this over time. If you are consistent with them over time, they will see you as dependable, credible, and trustworthy.

3. Follow through on your commitments. If you promise to send information or to follow up, do it. You will gain loyalty and trust by always doing what you say you will do.