Certainly, the phone is one way to keep in touch. The old-fashioned way often gets more attention. Make a plan, work the plan.
Tim Templeton in “The Referral of a Lifetime” discusses sending a card, letter or personalized newsletter (alternating which one you use) during each month of the year. For example: For January, send a New Year’s card rather than being one of many sending holiday cards. In February, you might send some information of value given only to a select few (let them know that). In March, you might forward a newsletter. Make it about them & their needs, not about you. Certainly, it should have your contact information on the bottom. People don’t need to be sold. They want to know you are there to solve a pressing problem for them. You might have heard, people buy more from pain than pleasure. So think about your ideal clients’ pressing initial problem. Then what is the next problem stemming from solving the first one, etc.?
If you have employees, give them an appreciation budget for small gifts or when possible, meetings during a meal. Let them know you are here to help and to let you know when they are having a problem that stumps them. Even if you are not in that field, you can probably refer them to others. Be sure to give superior service once they are your customer. Then you could keep them for life!
This is just the tip of the iceberg. Staying in touch with prospects or customers can be enjoyable (automate it whenever possible). You want to serve them in a specific way. Isn’t that the reason you went into the field? Yes, you deserve to make a profit as well. You are in business. Make certain your contacts are well-served. They deserve it.
Please let me know what you have found helpful. I will respond.