Ask How do you use limited-time offers to attract new members to a membership site?

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I want to attract more members to my membership site and I have been thinking of how to get started. I've heard that limited-time offers can work, but I don't know the best way to use them. Should I offer discounts, exclusive content, or something else? I also don't know how long the offer should last or how to promote it. I don't want to lose potential members by doing it wrong. How do you use limited-time offers to attract new members to a membership site?