Hmm, could be interesting to have an embedded tag that counts the number of times the note was opened and keeps the last date it was viewed (I'm toying with all kinds of tags). Then you could sort results by these tags.
Instead of tags, perhaps semantic search could help. Given some context (e.g., the note or section that you currently work on, or an explicit prompt), the search should provide the most similar sections in your note collection. In addition, you could let AI sift through the notes that come up, refine the search, and suggest what's relevant.