If you have a gift… share it, for fun and profit!
If you are good with a guitar or can carry a tune (or this even works better if you are the lousiest singer in the world!). Record a video singing Happy Birthday to your client and then send it to your client via email on their birthday.
I guarantee you that they will pass it along several times! I know one professional doing this has said that they have received more referrals since starting this special practice than they got in their entire career before doing it!
Being a bad singer actually helps the video get passed along… and if you can swallow your pride and laugh at yourself, you’ve just identified yourself as an advisor they can trust. Think about it… and then do it!