This nostr search tool by nostr:npub1vp8fdcyejd4pqjyrjk9sgz68vuhq7pyvnzk8j0ehlljvwgp8n6eqsrnpsw is still one of my favorite ways to search for notes. I was able to find one I posted over a year and a half ago relatively easily by narrowing it down within a date range. 

https://advancednostrsearch.vercel.app