Ask What’s the best way to analyze member engagement over time?

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I run a membership site, but I have no idea how to track member engagement over time. I want to know if people are active or losing interest. I'm not sure what tools to use or what data to look at. Should I check login frequency, content views, or something else? I also want to spot trends so I can improve retention. I don't want to guess. I need a clear way to measure engagement.

What's the best way to analyze member engagement over time?