How do I find a specific thread and isolate it from others once I’ve filtered by npub? Is there a thread id or do I have to wing it using *created_at*

also I know that the relays based on me.untethr.nostr-relay (both of em) support querying over http.

curl -XGET https://relay.kronkltd.net/q -d '[{"authors":["47b38f4d3721390d5b6bef78dae3f3e3888ecdbf1844fbb33b88721d366d5c88"], "limit": 5}]'