See If you see a Could Not Create Apple ID or Could Not Set Up iCloud message https://support.apple.com/en-us/HT210743. From the document (and see the remedy given in the document for each situation)
"If you see a Could Not Create Apple ID message, it means that you have exceeded the number of new Apple IDs you can set up with iCloud on a single device in one year."
"If you see a Could Not Set Up iCloud message, it means that you have exceeded the number of Apple IDs you can set up with iCloud on a single device in one year."
Again, see the remedy given in the document for each situation. Also, note that if you want to use a new Apple ID, you can create it on another device and use it from any device.
If you need to, use these support options for help:
Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 Be patient. Phone support sometimes is not available.
Apple ID Support https://support.apple.com/apple-id
Apple Support Twitter https://twitter.com/AppleSupport There may be an hour or so wait.
Apple ID account security for country-specific and region-specific help