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I Replaced Iphone 7 plus screen now when i use my phone while playing pubg if i use more than 2 fingers than my screen moves 90degree or my aim go from one place to another or player stops what should i do

Double check in your Accessibility settings that you don’t have any Gestures on for swiping or using 3 finger touch. Sounds like you may have Rotate-Lock set to a 3 finger swipe or something similar so when you’re gaming and use 3 fingers, it thinks you’re trying to activate or deactivate rotation lock, which would cause your screen to rotate 90 degrees. It may be unrelated to software though, so you could try a screen replacement to see if that resolves any touch issues that won’t be fixed by factory reset.