you cant, as there will be a server with that communication in order for the other person to see it. best you can do is stay anon and only connect with tor. make a nym , create the nsec using amber running over orbot. log into your npub on aethyst over orbot using amethyst / garnet. only connect to relays running over tor

GitHub

GitHub - 0xtrr/onion-service-nostr-relays: A list of nostr relays exposed as onion services

A list of nostr relays exposed as onion services. Contribute to 0xtrr/onion-service-nostr-relays development by creating an account on GitHub.

and should be assumed you are not using the app store with your doxed google acct to download the apps.