Your log didn’t show anything out of the ordinary.
I’m thinking this may be a re-install of WSUS (https://www.ajtek.ca/wsus/how-to-remove-wsus-completely-and-reinstall-it/) but let’s try a couple more things first.
Run the following first:
.\Clean-WSUS.ps1 -SetApplicationPoolMemory 0
Then Run 3 times:
.\Clean-WSUS.ps1 -RemoveSynchronizationLogs -DatabaseMaintenance -SaveReport TXT
Then run 3 times:
.\Clean-WSUS.ps1 -DeclineMultipleTypesOfUpdates -SaveReport TXT
Then run another 3 times:
.\Clean-WSUS.ps1 -DatabaseMaintenance -SaveReport TXT
.\Clean-WSUS.ps1 -FirstRun -HelpMe
Zip and then attach all 11 log files to the ticket.
If this can’t be done, then it’s too far-gone to bring back to life and you’ll need to reinstall WSUS.