Add an Onion-Location header to your site
Publish an Onion-Location header in nginx so Tor Browser offers your onion address, then close the leaks that undo it: redirects and third-party assets.
#onion-service
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Host an .onion site on your VPS
Run a v3 onion service on Ubuntu with tor and nginx bound to loopback, then close the leaks that link the address back to your public IP.
SSH over a Tor onion service, no open ports
Put sshd behind a Tor onion service so the VPS answers on no inbound port. Setup, v3 client authorisation, and the exact order that avoids a lockout.