How I close my account. I don’t want to use ICloud anymore.

If you mean that you want to cancel an upgraded iCloud storage plan, cancel by downgrading to the free 5GB plan. See instructions in: Downgrade or cancel your iCloud storage plan - Apple Support

The following may also help: Manage your iCloud storage - Apple Support

Italiancactus Said:

"How I close my account. I don’t want to use iCloud anymore.“

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iCloud Remains:

As long as you have an Apple Account, you’ll have access to iCloud. It’s something you would have agreed to upon opening an Apple ID. That’s just the way it is :(

You cannot close the account because that is your Apple ID, BUT.....

you do not have to use it. I do not use it. You can turn off all syncing in all the apps and you no longer use it. Also turn off icloud drive and delete any data in icloud. That is pretty much it.