Ask How to promote a membership site on social media?

[SuperAffiliateX]

I want to get more people to join my membership site but I'm not sure how to use social media for promotion. I want to ask that can I focus on paid ads or organic posts? Do certain platforms work better than others? I also wonder if posting daily makes a difference or if engagement matters more. Should I offer free content to attract new members? I don't want to waste time on things that don't work. What are the best ways to promote a membership site on social media?