MY iPhone 8 blacks screen

what happen?

goes into the toilet and the phone not working, i open the phone, i seperate the lcd to the phone and make it dry using the fan then i combined it again and its already working. but it keeps frozing so i did multiple force restart to fix. then the home button did not work and i reset my all settings then it work again. until it did not touch the screen again. so i just let it first then i sleep because that already evening. when i woke up my phone got black screen.

what i already try:

force restart- didnt work

reset iphone tru computer- didnt work it says theres an error.

what will i do??? is this cost a lot than replacing an lcd? is this can still fix?