I can’t send out or receive iMessage

Any error messages given?

If FaceTime and iMessage is supported in your region, did you already check the troubleshooting mentioned in the related article?

If you can’t turn on or sign in to iMessage or FaceTime - Apple Support

Can you send and receive iMessages, using your carrier network?

Does your carrier support the use of iMessage?

Wireless carrier support and features for iPhone in the United States and Canada - Apple Support

Here are some more things to try:

If you can't send or receive messages on your iPhone or iPad - Apple Support

Can you send normal text messages?

Contact Apple Support if you still can't send or receive messages

Contact your carrier if you still can't receive SMS messages

If you still have issues with iMessage, contact the official Apple Support, only they can look into your personal data and settings from their side.

We are all users here, just like you, and can't do that.

payment33 ~ If the problem is on your iPhone XS Max, does it still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Did you already click on the blue links, to open the related help articles?