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IMHO you should consider to add relays of well known clients (most of them are running own relay) as...
wss://relay.damus.io wss://relay.snort.social wss://relay.plebstr.com wss://nostr.rocks
also aggregators like these make some sense to me...
wss://purplepag.es/ wss://relayable.org
then you can consider adding some paid relays that bring a special feature or will be more persistent...
wss://filter.nostr.wine wss://eden.nostr.land wss://relay.nostriches.org