How to delete iCloud information
How do you delete items in your icloud?
iPhone XS Max, iOS 14
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Look within this article for options to do so, Manage your iCloud storage - Apple Support
Note that some of these steps are non-undoable (so you will not be able to revert or recover some data types!) I would recommend backing up your data if you think you will need it.
There are options to save data from iCloud on another device (say computer), prior to deleting it. Archive or make copies of the information you store in iCloud - Apple Support