My iPhone X damaged by water

If you vital documents or priceless photos on it you can try to find a reputable 3rd party repair site (the ones posting fake questions here do not qualify) and have them do enough repairs to back up all your information. This will possibly void your chance to get an out-of-warranty replacement unit as mentioned by Alan Eckert.

Take it to Apple and ask for to sell you an out of warranty emplacement for it.

Nothing. If it was turned off and allowed to sit to dry and is still not working, you need a new phone.