Q: I would like to cancel my Icloud account.  Can I please get some assistance?

Just stop using it.

There is no need to do anything else.

If you didn't purchase additional storage you don't need to do anything.

If you have additional storage, the following is from Manage your iCloud storage

• If you need more iCloud storage, you can purchase additional iCloud storage from your iOS device, Mac, or PC. Learn more about your iCloud storage plan. If you don't need the additional storage that you purchased, you can downgrade your storage.
• Get help resolving storage issues.
• For a full refund, contact iCloud Support within 15 days of an upgrade or within 45 days after a yearly payment. Partial refunds are available where required by law.