How do I get rid of iCloud?

If you are getting messages., its because you are logged in.

You can go to Apple Menu->System Preferences->iCloud and make absolutely sure you are not logged in there.

Beyond that there is no way to get rid of iCloud as it is a built in component of macOS.

See these articles https://support.apple.com/en-in/HT204247

https://support.apple.com/en-us/HT208504

Not sure how to get rid of iCloud on your MacBook other than having the iCloud ID deleted, which would probably be done by someone at Apple Tech Support. I looked on appleid.com and did not see a way to delete an ID.

Do you use iCloud on an iPhone or other device? If you haven't logged in on your Mac, perhaps from somewhere else?

You could log into iCloud.com to see what is filling up your iCloud storage.

Good luck,

Mindy :)