Based on your mention of having $200k worth of Bitcoin Cash, I infer that you own somewhere in the ballpark of 500-1000 BTC. At current prices this puts your total crypto holdings at USD$2 million or possibly much more. You have won the game. Stop playing. Even if you owe 35% of the proceeds to various governments upon selling your coins, you'll still have well over a million bucks. Don't let the tax tail wag the dog. Bitcoins are quite volatile and speculative. You could easily be FI right now if you diversify your holdings. But having so much in BTC or any cryptocurrency, there's way too much uncertainty to credibly claim you're FI based on those holdings alone. Even if you're a true believer in the potential of blockchain technology in general, whether the BTC implementation of that technology will hold its value over time is something that nobody can really predict.
I don't know of any magic bullet to avoid the taxes, sorry. I suppose you could move to Washington or Texas or another state without income tax, and sell to save 10%. But the federal tax man will get his share, and I really believe that you're playing with fire letting that much of your net worth ride in one cryptocurrency just because you're afraid of the tax bill. Get at least USD$1 million out. Today. Or if you plan to move first, go get a U-Haul today and sell next week.