I don't know if these already exist, but thinking long-term of how to prevent Reddit-like problems:
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An option to move a post to a different community (with the agreement of the other community's moderators) if the post is in the wrong community, but otherwise seems valid/good-faith/high-effort/etc.
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And for the opposite situation where the post is just garbage, but highly upvoted by bots/brigading, there could be a "nuke it from orbit" option that not only deletes it and bans the poster, but also bans everyone that upvoted it.