Need to delete an iCloud account
I need to delete the account I no longer have access to on my phone and put my new account on my device
iPhone XS
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You will need to regain access to the account to remove it from your phone.
Start here: https://iforgot.apple.com
If you can't do that, you'll need to provide Apple with the original proof of purchase for the device from an authorized retailer to have the activation lock removed.