How to Identify New/Lost Clients in Tableau table last 4 Weeks?

Hi everyone,

I have a count table in Tableau for the last 4 weeks, and I’m tracking the number of clients. I can see changes in the client count from week to week, but I want to identify which clients by name are causing these changes. Specifically, I want to know which advertisers are new and which ones are lost each week.

How can I achieve this in Tableau? Any help is greatly appreciated.