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How do I reduce my existing icloud storage? I can't find any instructions.
If you mean manage your iCloud storage, see this.
Manage your iCloud storage - Apple Support
If you want to downgrade your iCloud+ storage plan, see this.
Downgrade or cancel your iCloud+ plan - Apple Support
If you mean manage your iCloud storage, see this.
Manage your iCloud storage - Apple Support
If you want to downgrade your iCloud+ storage plan, see this.
Downgrade or cancel your iCloud+ plan - Apple Support
It's not clear if you're referring to iCloud in general, or iCloud Drive.
At any rate, referring to the iCloud user guide may reveal the answer for you:
Delete files in iCloud Drive on iCloud.com - Apple Support
icloud storage
