Ask What’s the best strategy for keeping my content fresh for long-term members?

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I run a membership site, and I'm struggling to keep my content fresh. New members seem happy, but long-term members might be getting bored. I don't want them to lose interest and leave. I'm not sure if I should update old content, add new topics, or do something else. I also don't know how often I should make changes. I want to keep members engaged without overwhelming myself.

What's the best strategy for keeping my content fresh for long-term members?