Tor relies on Internet access, I don't think anyone here can actually "run their own relay"

You can pay for permission to run a relay, but not just do it sovereignly by yourself

Modern consumer electronics are also so full of backdoors that there's probably nothing stopping authorities from just finding you and shutting your operations down by force

Your best bet is really to rely on public opinion and try to raise awareness so it's "politically difficult" to have you imprisoned/tortured/killed for running a nostr relay