See this Apple article: Upgrade to iCloud+
Upgrade to iCloud+ - Apple Support
FYI -> You pay monthly for iCloud storage.
The subscription runs as long as you don't downgrade.
You cannot deactivate/pause the subscription for 1 month, but you can downgrade to free (5 GB).
The iCloud + subscription will be terminated depending on the start date.
If you start on August 1 and are going to cancel now, the subscription will stop on November 1.
a monthly term is used.
Read carefully -> this Apple article: Downgrade or cancel your iCloud+ plan
Downgrade or cancel your iCloud+ plan - Apple Support (PH)