how to make them visible and allocate attention to them has been a bit unclear
Maybe an opt-in/opt-out “novice mode” which turns, say, the first appearance of a niche LW term in every post into a link to that term’s LW wiki page? Which you can turn off in the settings, and which is either on by default (with a notification on how to turn it off), or the sign-up process queries you about whether you want to turn it on, or something along these lines.
Alternatively, a button for each post which fetches the list of idiosyncratic LW terms mentioned in it, and links to their LW wiki pages?
Maybe an opt-in/opt-out “novice mode” which turns, say, the first appearance of a niche LW term in every post into a link to that term’s LW wiki page? Which you can turn off in the settings, and which is either on by default (with a notification on how to turn it off), or the sign-up process queries you about whether you want to turn it on, or something along these lines.
Alternatively, a button for each post which fetches the list of idiosyncratic LW terms mentioned in it, and links to their LW wiki pages?