You have two options, either get the screen changed or buy a new phone. Getting the screen changed is a bit costly, may cost you a few thousand bucks. Remember to go to the service center only for screen replacement.
Open the contacts of your old device and export all the contacts to the SD card or the phone memory into a .vcf file. Transfer this vcf file in the Asus Zenfone Live and just open it. All contacts will be transferred and copied into the Asus Zenfone Live
Find a low dust workplace and clean the screen with a screen cleaner. Check the placement of the the screen guard and remove the back side cover of screen guard. Align one corner of the screen and start sticking it from one end to other.
There are several gestures option including double tap to wake up, double tap to turn the screen off, Motion gestures and the One Hand Mode that reduces the screens size so that you can use the phone in a smaller window.