To add on, nv use a hair dryer to try to dry the inside. You
will push moisture further in, causing the water to spread.
What you should do after you turn it off is to try to wipe off
any water you can see. after that, keep it in an airtight container
with rice, or those hungry hippo thingy or anything that absorbs
moisture in the surrounding atmosphere.
wait for a day before turning on your phone to make sure all the
water has evaporated.
additionally you can pray to whatever deity, higher order,
idols, shifu, or whoever if it helps.
If it still does not turn on then u need to get professional
help from a repair store.