Unfortunately, if this follows history, the safest thing to do is to not do anything, blend in, and wait for external help. Afaik, only a handful of Germans who resisted survived. But, I don’t see any help for us coming anytime soon.
Yeah, there are some possibilities. For example, if a strong resistance leader emerged. But, are there any good candidates for that role? I can't think of any.
Things like this are stopped by movements, not individual heroes. There are almost certainly organizations in your area already working against this. No one is coming to save us. But if anyone does it is the people who were already trying to, bolstered by people like you who see it now. Get in there.
I recognize the optimism, but realistically, without a strong and strategic leader, coordination will collapse into disorganization and infighting. Historical examples like Occupy Wall Street demonstrate that leaderless movements tend to self-sabotage and generate instability without achieving meaningful outcomes.