Iphone X frozen on apple logo screen
How do I turn on my IPhone X without losing any data, after a update to the lasted IOS? It started working slow and then froze on black, apple logo screen. I've pushed quickly on the up, down volume buttons then the power off button, but still nothing. I've been having trouble for two days now, please help. Any knowledgeable suggestions are greatly appreciated.
iPhone X, iOS 11.2.6, null