Can I only pay for iCloud storage? I do not need the other things that I had before

See the Related Article linked above for what is offered for iCloud+, and pricing.

iCloud+ subscriptions are billed based on storage.

Apple One subscriptions provide storage, and can include other content such as Apple TV+, Apple Music, and such. If you want solely storage, then one of the Apple One plans probably won’t interest.

you came here from the support article that tells you pricing for iCloud storage..

here is another that may help?

Upgrade to iCloud+ - Apple Support

Nina4974 Said:

"Can I only pay for iCloud storage? I do not need the other things that I had before: I was being billed too much, I would like to pay less. I need iCloud storage"

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Exporting All of iCloud:

All would be lost, if it is not download to your device itself prior to upgrading. So, export all of iCloud first. Use my User Tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip