My Apple Watch screen won’t turn on

I had my apple watch on water reserve in the water. It died even though I charged it that night before. It will send me a notification that my Apple Watch is fully charged but the screen won’t turn on. I have tried to hold down the crown and the power button at the same time for over 10 seconds. I tried holding the power button down for over 10 seconds too. If anyone has anything else for me to try. I would love to know and try.