ssh into your pi-hole if possible and try using commands systemctl status pihole-FTL Check the status, and if its disabled use the same command but with start instead of status. Also if this this your first time setup, double check that everything you did is correct, like the DNS setting on router, if the devices get the right DNS etc.
It was already empty since bots took over! I’m not surprised for what it’s happening, the way Reddit treated their users, and what happened afterwards.