Fix Geth

https://agstakingco.gitbook.io/eth-2-0-mainnet-staking-guide-lighthouse/

1) Stop Geth:

sudo systemctl stop geth

2) Remove Geth Database:

sudo -u geth geth removedb --datadir /var/lib/geth

It will ask if you'd like to delete chaindata (yes) and ancient data (no)

3) Start Geth:

sudo systemctl start geth

Geth will begin syncing again, which may take between 18 to 36 hours. You can check the geth logs to view progress.