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The CC can be purchased either as single app or complete CC with all the App of Creative Suite with few services.
You can cancel the single app & go for the complete CC, as that will give you access to all the App & the expenditure will be reasonable.
You can choose your option from www.adobe.com/specialoffer too (if eligible).
You can cancel the present CC without nay cancellation fee provided you buy another CC or you can change plan too of theCC from single App to Complete CC
If you upgrade to a Creative Cloud annual membership, you don't incur a cancellation charge on your existing membership. Upon upgrading, you receive a refund for the unused duration of existing memberships
Please let us know if it helped.