There are, make no mistake, a handful of small survivalist communities across the US but they are rather paranoid and reserved when it comes to promoting themselves for obvious reasons. I'd say you would be far more likely traveling the country, meeting new people, talking face to face with random people on the road for a long time and being able to find a niche group that would possible befriend you overtime if you got to know the right people and they trusted you. You would have a better chance at that than trying to find anything legit being promoted on the internet or the dark web.
Here's the very real and scary threat to being "free" and semi-independent today.... once you expose an existence of such a group you WILL catch the eyes of the glowies and you WILL start to be monitored 24/7. If there is one thing the government hates is independent groups of people who want freedom and strive for self-sufficiency. Doesn't matter if you obey the laws or not. They want to know everything and control everything, they are obsessed about being a sole force of oppression.