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Do you have an iCloud+ plan subscription?
Please check -> Go to -> Settings -> your name -> iCloud -> if you see 50 GB (or 200 GB or 2 TB or 6 TB or 12 TB) then you have an iCloud+ plan subscription.
If you have an iCloud+ plan subscription, you will receive a monthly bill from Apple, check your email box.
You pay monthly for iCloud+ plan storage.
The subscription runs as long as you don't downgrade.
See also the following Apple articles:
What's the difference between device storage and iCloud storage?
What's the difference between device storage and iCloud storage? - Apple Support
How to use iCloud on iPhone -> How to use iCloud on iPhone – Apple Support (UK)
Manage your iCloud storage -> Manage your iCloud storage - Apple Support