Want to cancel and delete iCloud on my iPhone
Delete iCloud on iPhone
iPhone 14 Plus, iOS 16
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Read this support article about how to downgrade or cancel your iCloud+ storage plan on an Apple mobile device, a Mac, or a PC. --> Downgrade or cancel your iCloud+ plan - Apple Support
Note what happens when you downgrade.
Basic free iCloud will always be available. If you do not want to use its features, read this support article about disabling some: Change which apps sync and store data with iCloud - Apple Support
iCloud is part of your Apple ID/Account, and any device signed into your ID. It isn't on your iPhone in particular.