Weird graphic issues on my iPhone's screen?

My phone got water damage that it made a stuck pixel on the upper left and has water inside the screen on Thursdsy. The water went away when I placed it in instant rice. But today there's like some lines showing up, and when it was on booting screen, it showed some blue red and green dots everywhere, I tried powering it off and ALL but still won't work. Please help! I'm using this phone for my school as there's books installed on it, school starting next 2 weeks!

Switch it off and dry it for a day. Wet board can damage the phone circuits.

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