The fediverse is small, and thats both a blessing and a curse - one of its several blessings is that in a smaller space we all individually have a bigger impact on what the culture of this space is like.
On this comm (and on lemmy broadly) there's a lot of discussion about how to grow the fediverse, what to improve, but an easy thing you can do for the fediverse is right in front of us-
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Be kind
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Ask people what they think, and why
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Approach folks you disagree with with curiosity rather than hostility (EDIT: no, this is not specifically referring to Nazis. I get it, they're the first thing that comes to mind. I'm not telling you to approve of Nazis I'm just saying be kind to your fellow lemmites)
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Engage sincerely
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Ask yourself if there's something nice you can say
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Make this small space worth being in
A platform lives or dies by what's available on said platform and often we have this conversation in the context of "content" or posts - and we may never have as much content as reddit does. But content and posts aren't the only thing this kind of platform offers- it also offers people. It offers community, and human interaction.
Culture and community is lemmy and the fediverse's biggest differentiator, and we all have a role to play in shaping the culture of this space.
The biggest thing you can do to help the fediverse is make it a place worth being.