Good question. Especially since a lot of these are things I only notice in hindsight.
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Volunteer to implement helpful hints at a systematic level, even small things like linking the join-lemmy.org documentation on the signup page by default, and adding placeholder text for instance and community admins to see and tweak for their own rules. I say 'volunteer' because the devs were, and are, far too busy to do everything themselves.
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Create and share around image/infographic guides on why Lemmy is different to reddit. This could actually have been a good promotion tool too, back when we really needed it. I actually hastily made a quick one during the sudden migration, but I don't think it's worth digging up, it was very basic and not well thought-through.
Then again, some people had no real problems with reddit except for the API stuff. The people who came here earlier often had complaints about reddit's overall community trends, you know, people replying to headlines and clearly not reading the actual article at all, empty fluff like a random pun being the three highest rated comments, buttloads of junk replies like 'wow', 'this', 'i wish i could upvote twice' to scroll past. And I don't think there's much I myself could do to fight things like that, without putting in far too much time and effort (this site isn't my life!).
Even putting aside biases or conspiracies, mass media and (for-profit) social media has an economic incentive to get people passionate and interested and viewing more ads. So there are systematic factors at play, which I'd say are enhanced by digital technology.