I'm sorry to be the one to inform you of this but it is technically impossible to be pseudonymous while being active on the internet when the Five Eyes are after you.

Every darknet market ends up busted one way or another. Also INB4 "but satoshi is pseudonymous". The US Gov likely knows who he is, or at least has some very good guesses as to his identity. If they wanted to prosecute him, they would find him.

This is terrible advice.