Use 2 paid relays as Read/Write relays, like https://azzamo.net/, https://jellyfish.land/ or https://nostr.wine/

Use 1 popular and free relay as Read/Write relay

Use a few free popular Relays in only-read mode, like relay.damus.io, relay.primal.net or nos.lol etc.

Use 1 inbox relay for DMs

Extra Points for a local relay for backups.