I agree with this guy. If you keep your sub blacked out, people will just move to other subs or make alternatives. If you open it, you'll be able to advertise Lemmy. Ultimately, that's the only thing that's going to kill Reddit. Lemmy has to grow into a viable competitor and poach Reddit's userbase.

Hell, make automod comment about Lemmy on every submission. Write a set of instructions. Go to xyz URL, make an account, download Liftoff, subscribe to your new community on Lemmy.

Do what @zebs said, but additionally restrict posting to only approved users and set yourself as the only one approved. Also use a script to delete all posts there and repost them here. People will go where the content is, so give them a reason to switch

Nah. Leave it dark. Don’t give the content back unless you can remove it all except a message that says your on Lemmy now