Why is my touch screen not working?

hi my phone (j7 pro 2017) got soaked in the water while i was asleep. i dont know what was the legnth of time it got soaked. after i saw that my phone was wet i hurriedly put it in an uncooked rice for 3 days. my home, recents, and back keys are working fine but my touch screen is not responding. is the ldi located in the 2nd sim and sd card slot? i saw a small red square inside. what can i do? thank you for the answer :)

please reply asap if possible thanks