Thank you for visiting Apple Support Communities.
It looks like you restored a backup to your iPhone X and since then you're not able to accept updated iCloud Terms and Conditions. Let's see if we can resolve this together. Here are some troubleshooting steps to start with:
First, make sure to restart your iPhone (if you haven't already.) -- Restart your iPhone, iPad, or iPod touch
Next, check and see if Restrictions are enabled on your device. -- Use parental controls on your iPhone, iPad, and iPod touch
If so, disable restrictions and try accepting the iCloud Terms and Conditions again.
If Restrictions are not enabled, or that step doesn't solve it, next try signing out of iCloud. Once you're signed out, restart your iPhone, and then sign back in to iCloud. For help with signing out/in to iCloud, see the following Support articles:
Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
Sign in with your Apple ID - Apple Support
Let us know if any of these steps help.
Best Regards.