The best way to maintain privacy when buying and selling cryptocurrency is to use an anonymous cryptocurrency wallet. An anonymous cryptocurrency wallet is a wallet that operates on the blockchain but doesn't require any personally identifying information in order to use it. This means that you can purchase and sell cryptocurrencies without any of your information being tied to your transactions.
There are many different types of anonymous wallets, but one of the most popular is
Ledger Nano X, ZenGo, and Trezor. Trezor uses technology called Tor, which allows people to browse the internet anonymously, making it easier for them to buy and sell cryptocurrencies without having their identities revealed.