This is a helpful overview at Apple Support which I'm shamelessly copy/pasting below: Lastly, reinstall the version of macOS offered in the Restore dialog. Doing this will destroy the encryption key created by FileVault, and the data is supposedly garbled and unsalvageable. When you're ready to trade, boot into macOS Recovery mode and erase the internal drive Intel | Silicon in Disk Utility. Also do a TimeMachine backup to preserve your data and use to re-create your account(s) on the new trade-up. If you haven't already done so, use FileVault to encrypt the internal drive.
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