How do I delete all iPhone X data

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

You can turn off personalization features in the App Store, Apple Books, the iTunes Store, Apple TV, Podcasts, and for subscriptions from Apple by turning off Personalized Recommendations for your Apple Account. On your iOS, iPadOS, or visionOS device, go to Settings > [your name] > Media & Purchases > View Account, and then tap to turn off Personalized Recommendations. You can clear the app usage data logged on your device for personalization on iOS and iPadOS devices by going to Settings > App Store > Personalized Recommendations and tapping Clear App Usage Data. This will not delete data logged on your device, but any data logged at the point when you clear your app usage data will no longer be used for personalization. The App Store personalization features will use new data logged after you cleared your app usage data history.