I think you just need to promote it at the right time to the right audience, and suggest the right instances. People who are saying they’re sick of Reddit, especially when Reddit does something to shoot themselves in the foot. I think just trying to force it onto people will have the opposite effect.

@Blaze@feddit.org puts a lot of effort into promoting Lemmy on Reddit, they’ll have some decent input on how to promote it!

There’s also !fedigrow@lemm.ee which is a community around this kind of thing if you’re interested.