Add a few that are geographically linked to you for speed.

Add a few in other countries that speak your native language to broaden your horizons.

Check the users per relay (top 30) on https://stats.nostr.band/ and add a few of those just to make sure you're grabbing most of the content that's out there.

Lastly, add wss://nostr.mutinywallet.com because it will blast your notes out to every known relay that it can find, massively broadening your reach.