The only person you can rely on to stop them is yourself first, then second everyone else.
Start by killing the Nazi in your own head, to paraphrase a slogan. Then oppose them and find others to oppose them.
Only one thing could have broken our movement — if the adversary had understood its principle and from the first day had smashed, with the most extreme brutality, the nucleus of our new movement.
A paraphrase/translation from Hitler.
Understand them. Do not mistake their intentions. Do not think they only want what they say they want or that they will only use their current methods to get it. They want genocide and they’ll use whatever means they think they can get away with to get it.
That means opposing them at every turn everywhere you see them in your own life and encouraging others to do the same
I also think Hitler suffered from a lack of imagination. It’s not only crushing their movement that will stop them, though that is vital. In the long term, and we may still be at a moment where we can worry about the long term, building a world that takes their power away is also a solution. Even better is building a world where they couldn’t take power to begin with.
Build a world where LGBT people are not an easy target and the fascists will stop having them to be an easy (first) target. Build a world where low grade scam artists like Desantis can’t take over a state and it’ll make the next Desantis have to do that much more work. (Admittedly that probably does require abandoning our current democracy…)