1 - get a Monero wallet (feather or mymonero)
2- get the tor browser
3- Swap your bitcoin for Monero (XMR). The best no-kyc exchange I think is xchange.me, they only charge 1%. They have a great tor website. Navigate here with your tor browser:
http://xmxmrjvjw3drvegm7m5gpqp3bsgp3x3bgc2x7jc76cacr74jhdwop7id.onion
4- Once you get the monero, movie it to a second monero address.
Because of how Monero works, your crypto is now fully anonymous. You can now swap it back for bitcoin or any other crypto, and your coins are untraceable.
This is a 100% way, since I watched an interview with a man in uniform and he talked about exactly such a money laundering scheme.