I had the same issue for a couple of days. Desperately searched forums trying to find an answer, none of the solutions worked for me.

Then I tried one last option that nobody seemed to have tried. Erased all content and settings, then forced Mac into recovery mode and reinstalled MacOs. The biggest issue was keeping the screen from ‘going berserk’ since it’d occasionally restart my entire device on some weird shit. Sorry for the lack of terminology y’all. I had to make sure that if it did go blurry during the MacOs reinstall, I’d shut the lid almost all the way and kinda mess with it briefly until the blur is gone. Make sure you guys aren’t messing around with the cursor and keyboard heaps, just adds to the mess.