The One Ui 6.1 dilemma

[Gibsomatic]

i have been trying everything for the past week to get my s21 ultra SM-G998U touch screen to function again. Im facing the same issue concerning the One UI 6.1 update. At first i tried flashing an older firmware which didn't work since there were no versions with the same binary as mine. Then I stumbled upon your post. I went on to try and root my device and install TWRP but the thing is my device didn't allow me to turn on OEM unlocking (im using the s pen btw). With that in my way i kept trying multiple alternative methods including adb fastboot bootloader unlocker yet nothing seemed to work for me. Do you have any idea on how i can fix this issue?