Try to charge the device. If nothing shows up and you don't hear the plugged-in sound, your best option is to open up the phone and disconnect and connect the battery again.
If you hear the phone charge but nothing shows up, you need to get the screen replaced.
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In case, if disconnecting the battery method didn't work, then you should consider get the screen replaced and then troubleshooting it.
Try to charge the device. If nothing shows up and you don't hear the plugged-in sound, your best option is to open up the phone and disconnect and connect the battery again.
If you hear the phone charge but nothing shows up, you need to get the screen replaced.