Move to the .onion and accept payments in BTC.
Not my preferred choice -- the governments will force peoples' hands.
Age verification was ruled unconstitutional by the US Federal courts
ASHCROFT V. AMERICAN CIVIL LIBERTIES UNION (00-1293) 535 U.S. 564 (2002)
but there are other onerous laws and regulations regarding explicit content on the books so far held constitutional in part thus enforceable.
You can try to play internet police at your own expense or leave the public internet -- good luck to the winners.
Scarcity ensures profits for mediocrity.
