Which version of macOS do I need to rollback to in order to regain use of external monitors via Thunderbolt port?

MacBook Pro 8,1 w/ Intel HD Graphics 3000 512 MB. I've lost the use of Thunderbolt Ports after upgrading to Ventura 13.7.2.

This totally defeats the purpose of restoring my old MacBook. Is there a workaround to regain use of the monitor? How far back do I need to downgrade until I can connect external monitors again?

Thanks!