I added two additional details at the bottom of posts: tags, and links to other posts that have the same tag.
I am trying to use them differently from categories so that they remain targeted. I mean that if I find I am adding a tag to many posts and only mean something vague by it, that is probably not going to be very helpful to future me.
The other, as yet unsolved problem, is if I should automate bidirectional links to posts. For now, I do it manually, as in the Borges and AI ↔ Hoffmann’s Wobble linking. I think manually is good enough for now. Note that some friction is good: I don’t really care if the computer knows there is a link, I want my brain to know there is a link.