After the initial meeting, you should ensure that you communicate with the client based on the urgency of the case.
An in-depth LexisNexis report on avoiding malpractice through proper onboarding processes mentions the importance of continued client communication. It says:
"There is usually a flurry of activity and a lot of dialog at the beginning of client / attorney relationships. Constant communication is reassurance to clients that action is being taken, their interests are being served and everything is in control. After the initial courting, activity normally slows down, which is when communication concerns and misunderstandings can surface." - Source
The author recommends communication on a monthly basis, but for more urgent cases the time frame will be dictated by court proceedings and legal events out of your control.
Note that, while letting urgency dictate the frequency of communication is practical, it will help you and you clients form and maintain a great relationship if you check in with them proactively to address any issues or concerns they might have. This is explained below by Nicole Black writing on MyCase:
"One of the biggest mistakes you can make as a lawyer is only talking to your clients when you need something from them, or when they call to yell at you. Set up a protocol to contact your clients on a recurring pattern, just to check in. Before you call, review the case status, so that you can provide a cogent update and answer any questions that may arise during the course of your conversation. A main ingredient of the vast majority of bar complaints circles around lawyers’ poor communication cycles with clients. I often recommend contacting clients every six weeks. And, I think a phone call is most effective. People receive enough email these days." - Source