Still wait for the phone to vibrate before you proceed.
Any headset with USB-C interface will do the trick.
Most of the time, it will actually take just around 4 seconds before the device responds.
This time, your phone will enter the Recovery Mode.
Using the Volume Down rocker, highlight Wipe cache partition, and then press the Power key to select it.
Highlight Yes, and press the Power key again.
The process will take just a couple of seconds. So once the cache partition is wiped off of its contents, press the Power key to reboot your device.
This time, the reboot will take a little longer than usual as the system rebuilds the cache. But once your Galaxy S21 reaches the lock screen, it’s good to go