1) Turn off discontinue use. 2) Open phone case remove battery. 3) Submerge phone in a bag of dry rice for several days. 4) Contact a phone repair shop and bring your phone in for a screen replacement if you want for $110.00 approximately. 5) Leaving the screen as is will most likely be fine as no damage has occurred, however water could easily reenter again and you might not be as lucky next time.
⚠️ According to Android Authority 5,761 phone screens are broken every hour worldwide. That's one phone evey 1.6 seconds.