Maybe it’s not the best answer, but what I’ve been doing is mostly posting to LW/AF and mostly only posting to EAF for things that are very strongly EA relevant, as in so relevant to EA I would have posted them to EAF if LW didn’t exist. I don’t have a consistent policy for cross-posting myself, other than that I only cross-post when it feels particularly likely that the content is strongly relevant to both communities independent of the shared aspects of the two sites’ cultures.
Maybe it’s not the best answer, but what I’ve been doing is mostly posting to LW/AF and mostly only posting to EAF for things that are very strongly EA relevant, as in so relevant to EA I would have posted them to EAF if LW didn’t exist. I don’t have a consistent policy for cross-posting myself, other than that I only cross-post when it feels particularly likely that the content is strongly relevant to both communities independent of the shared aspects of the two sites’ cultures.