iOS 14.1.1 security update has RUINED my iPhone X

Robulation wrote:

So, I've always updated to the latest software, but never had problems as persistent and crippling as this.

• My battery burned down from 100% to 26% in under 2 hours

• It's so unresponsive it's like using an iPad from 2005

• Everything is constantly crashing and causing my phone to reboot

• Face ID or picking up my phone doesn't seem to wake the screen

• The camera is unresponsive and quite often stays black on screen

• I could go on, but I'm bored of the problems I'm having

And what have you done to troubleshoot the issue?