Relays broadcast messages from and to users who are connected to them! Since I’m seeing your note here, it means we’re connected to at least one of the same relays.
You can always add more, but try not to add too many because it can cause lag, drain phone battery, and drain your cell data. I’ve been hovering around 12-18 relays for my whole time here and find it’s worked pretty well. I also recommend some paid relays to eliminate spam, especially nostr.wine.