First use https://nostr.band to find the date you started.

Then go to https://advancednostrsearch.vercel.app and search your npub with that date.

You might need to adjust the range up or down by a day to account for time zones.

If you can’t see the note in your client you may be missing some relays, but you can usually use nostr.band to see which ones you need to reconnect to.