Most people don't change unless they have to, and rarely even then. You'd have to make it so that they can't visit Reddit anymore.

Even on reddit itself, you can't get people to move from a sick community with hostile moderation to the preferred community. /r/Canada got taken over by /r/metacanada what feels like decades ago, and they turned it into a post modern bigoted classist hellhole, but it still ranks far above the "real" Canadian sub /r/OnGaurdForThee.

Maybe better not to compete with existing communities. Develop some anchor communities on Lemmy that are doing their own thing on topics that aren't well served on Reddit.

I think how fragmented lemmy is hurts it. I enjoy Mastodon more, because it doesn't matter what server a person uses, you have but a single feed of all the people you follow.

But here on lemmy, every server has its own communities and might even be having the same conversations apart from each other. While reddit is a giant single space for each conversation.

If there was a way to unite feeds so that, for example, /c/gaming gave you posts from every community /c/gaming you are subscribed to or federated with (or /m/gaming for us mbin folks).
I think we could really see a proper exodus from reddit as it becomes proper alternative.

and of course, the classic lemmy experience would remain for those that don't want to do that. Much like old.reddit remained strong in the face of the site remake.

EDIT:
Maybe what we need instead is multi-reddits. Custom made aggregate feeds made by the user, so you have full control over your aggregated feed. And they don't need to have the same names in that case.

I don't want the masses from Reddit to migrate to Lemmy. I want people currently on Lemmy to post and comment. More engagement is what we need. No one is going to move to Lemmy if they see the top posts are hours old with only 100 upvotes and no comments.

If they didn't leave Reddit by now, they like the new Reddit experience.

Where does the believe even originate from, that Redditors are any different than Lemmings? Basically the same people minus the youngest, because they stick with using Reddit. They might or might not migrate eventually.

Make communities here bigger by contributing and spread the word of Reddit alternative. Make search engines find Lemmy content and then it goes on it's own. I guess Bluesky will push the Fediverse, but I wonder how long people will stick to a Twitter esque when they could have Lemmy full text conversations and tree structures?

Send interesting Lemmy links to people you know. That's how they get interested, and check it out. You won't convince many people by extolling the benefits of the Fediverse, you just have to show them that they'll be entertained, and maybe they'll be somewhat more likely to switch if they know it won't enshittify. I'd say you should send links from instances that don't federate with some of the weirder places like Hexbear though, that's likely to turn people off until they realize how the Fediverse works.

One thing that we could use more of that draws people in is posts about relationship issues. Entertaining for almost everyone, and pretty much anyone can create them from their own experience.

Don't bother, just make your own communities or magazines and contribute to them regularly.

"If you build it, they will come."

You can tell people about it if you like (especially if it comes up casually in conversation), but if you try to push it too hard you'll drive people away.

If the fediverse grows too quickly, it will also introduce more problems existing systems may not be able to handle.

They allegedly remove posts/comments about lemmy? And even if they don't, I feel like it could have the opposite effect. People would see those posts just like ads/promotion/spam. Which would give lemmy a bad rep.
Unless something big happens, like some big community switching to lemmy, or someone with a big following promotes lemmy, it will hardly see a big spike in user count.

The only way is to passively "advertise" it. Maybe add the link to your lemmy account in your reddits about you section, if you are making OC add your lemmy handle there as well...

And the last way, which is most likely the best way to do it, is to post good content on lemmy, keep communities alive. And people will eventually join.

Lemmy needs to mature on a technical basis. The Lemmy service itself is still lacking significantly. But it it progressing.

Outside of technical limitations, focus on communities. A few good ones are better than many mediocre ones.