All businesses lose clients as they go along. Our company does, and I know all others do, too. What we need to think about is how to reduce the number we are losing or even how to get some of them back. Many times it can be as simple as calling them or having a meeting to see what they're doing now. Another effective method is to keep in regular contact with them.
Some advisors take things personally and if a client leaves, they're offended.
As you're doing your marketing, keep contacting the people who have stopped doing business with you. It can be as simple as including them with the marketing materials you're developing. I like using holidays as an excuse to make contact. Most areas of the country have huge sales on Coke or Pepsi for summer holidays such as Memorial Day, the Fourth of July and Labor Day. This is a simple way to get clients to visit one more time.