Fund an order, and mind the withdrawal PIN.
TorZon issues a fresh deposit address per request, and guards withdrawals with a separate PIN.
Hold your own coin in Feather or Cake for Monero, or Sparrow or Electrum for Bitcoin, rather than sending straight from an identity-checked exchange. Cake carries a built-in Bitcoin-to-Monero swap if you want to move into the private coin first.
Open the order, copy the deposit address, send from your wallet, and wait for confirmations. Keep the on-market balance small, and remember the withdrawal PIN is what protects that balance if your session is ever stolen, so treat it as seriously as the password.