Do you let business come to you naturally or are you constantly nurturing prospects? Trick question - you should be doing both. If you're good at what you do and you invest in ongoing marketing efforts then business will come to you naturally. But, it's also important to do some business development nurturing.
It's like when you're decorating your house. You invest in a houseplant, but then you fail to invest in taking care of that houseplant. It needs nurturing care. Sometimes specialized care. Or it won't last.