After being in a dormant state for over 12 hours, I assumed that nothing can be done and force-rebooted the system by holding a power button (for over five seconds).
system logs retrieved with
journalctl, filtered around at the time of the incident:
journalctl --since "2021-02-19 16:00:00" --until "2021-02-20 11:00:00" (note the
-- Reboot -- point)
Additionally, would this have been solvable if the magic SysRq key had been enabled? Or what if I were running an SSH server on the machine?