Keep on networking.
This is often the first thing that gets dropped when you become busy with clients work. I know; I’m guilty of it myself. But when you suddenly disappear from groups you have been a regular at, often the assumption is that you are no longer in business. Accept that networking is part of the ongoing development of your business, choose one or two groups that you will remain a regular at and keep going. Even if you are not looking for more clients, you will still establish relationships that you will benefit from later on.