AppleSuzie:
“How to cancel the iCloud subscription?: Got rid of my iPhone several years ago and have been trying to cancel the iCloud+ monthly charge ever since. I'm still being charged every month. How can I get it cancelled. Should I cancel my credit card as a last resort? Help!“
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Properly Downgrading iCloud:
1. Download All of iCloud, First:
Prior to downgrading, download all of iCloud. That way you do not lose any data, once downgrading.. Use my user tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip
then...
2. Downgrade your iCloud Plan:
If you want to get less storage in iCloud, downgrading your iCloud plan is the way to go. Note that this has a monthly fee. Here is the link to user: iCloud+ Plans and Pricing - Apple Support. Note that this service is not available in all countries/regions.