Ask What are the best ways to build authority and trust for a membership site?

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I'm creating a membership site and want to establish credibility. Building authority and trust is crucial for attracting and retaining members. I discovered that others use testimonials from satisfied members to build confidence. I know that consistently delivering valuable content also helps maintain trust over time. I've seen successful sites leverage social proof effectively, but I need more strategies to enhance my site's reputation. What are the best ways to build authority and trust for a membership site?