iCloud Turn Off iCloud? Keep Getting Notifications To Use It, I Don't Want It

[Brandy-Boi]

So recently I keep getting this notification daily asking me to enter in my iPhone passcode to continue using iCloud, I don't use iCloud and don't want to. I don't have a use for it and would like to know how to turn it off, I know its linked to your Apple ID so technically it can't truly be removed but how do I make sure nothing is getting synced to it and have none of my content stored there? I back up my phone to my iMac through Apple Music, I don't want anything going there and to make sure that once I make sure nothing is connected to the cloud it doesn't get deleted off my iPhone. I saw the iCloud tab under settings when clicking on my name/Apple ID, just want to understand it a bit more so I don't accidentally delete anything. If there's a way to have iCloud turned off/have nothing sync to it I'd love that so I can stop getting asked to use it everyday. It's been happening for the last week.