You need to fetch your kind3 notes.
For example, from two months ago this is still available (you need to check the "p" tags, not the relay list):
quoting note1jaf…ew4s{"wss://relay.nostr.band/":{"read":true,"write":true},"wss://nos.lol/":{"read":true,"write":true},"wss://relay.damus.io/":{"read":true,"write":true},"wss://relay.nostr.bg/":{"read":true,"write":true},"wss://nostr.bitcoiner.social/":{"read":true,"write":true},"wss://nostr.oxtr.dev/":{"read":true,"write":true},"wss://nostr.mom/":{"read":true,"write":true},"wss://nostr21.com":{"read":true,"write":true},"wss://relay.noswhere.com/":{"read":true,"write":true},"wss://eden.nostr.land/":{"read":true,"write":true},"wss://relay.snort.social/":{"read":true,"write":true},"wss://puravida.nostr.land/":{"read":true,"write":true},"wss://atlas.nostr.land/":{"read":true,"write":true},"wss://relay.nostr.com.au/":{"read":true,"write":true},"wss://nostr.milou.lol/":{"read":true,"write":true},"wss://relay.nostrati.com/":{"read":true,"write":true},"wss://relay.orangepill.dev/":{"read":true,"write":true},"wss://nostr-pub.wellorder.net/":{"read":true,"write":true},"wss://nostr.inosta.cc/":{"read":true,"write":true},"wss://nostr.land":{"read":true,"write":true}}