Several ways:
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Sell a good/service on XMRBazaar.com
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RetoSwap.com is a software you download that is a peer to peer decentralized exchange. You can pay others with whatever payment methods are supported PayPal, Zelle, Cash App, Amazon gift cards, cash-in-mail, etc.
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Centralized exchange (not recommended) you can give all of your KYC information to a centralized exchange such as Coinbase and buy something like USDC on there and then use an instant swap service such as trocador.app to convert the USDC into Monero.
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Mine it with your CPU: This is the slowest way but also the most permissionless