iPhone X screen lifting from body

That normally is a product of the battery swelling, which means it needs to replaced.

You need to take the iPhone to an Apple Store or authorized service provider in your region to get the battery replaced.

See here: iPhone Battery Replacement - Official Apple Support

Well its either that or a manufacturing defect of the screen and case.

Either way it needs to get fixed by Apple or an authorized service provider.

Best to take it in for a diagnostic and repair for whatever the issue is.

Still not clear. Are you saying the screen is detached from your iPhone's case?

If possible please provide a picture.

What do you mean "tap the screen myself"? What gets in the way?

What issue are you having?

Please explain, and provide as much detail aspossible regarding the issue you are having,