unable to use any boot commands (boot options, diagnostic, recovery) after Big Sur upgrade

I recently upgrade to Big Sur. Since then, my Mac OS's Windowserver keeps crashing when using parallels desktop's running quickbook. I tried running apple diagnostic by booting up my mac and hold down D (with or without option key).. the system would just boot normally to my login prompt and started mac normally. I tried to do the same with holding down options key (to select boot), or trying command R for "recovery" and command S for single user mode.. none of those works for me (system just keep rebooting it normally.. and yes, I tried both shutdown, reboot, hard reset.. and nothing works). I also try using an apple usb keyboard (and a dell keyboard) instead of my bluetooth wireless keyboard.. nothing seems to work. I have a 27" Imac Mid 2015 built. Anyone have the similar issue? Thanks in advance.