Seeing as you have only 5 I’d say more. I’m digging the mid teens here lately. Upper 20’s was tew much methinks
Discussion
5 is plenty, if you're using the right 5.
1. a blastr relay like wss://nostr.mutinywallet.com
write only, but publishes to dozens of the top relays.
2. an aggregator - nostr.band, nostr.lol, others
read many many relays with one connection
3. DM considerations. I don't get DMs from some folks unless I'm using the exact same relay. The aggregators don't seem to do those.