Get all application/vendor developers in the loop to make the transition to TLSġ.2, apply a lot of. Moving SQL Server connections to TLS 1.2 is not solely (or even mostly) a SQL server change. (Correspondingly, a common cause for sudden SQL Server application connectivity failures is a sysadmin's inadvisable, reckless deactivation of TLS 1.0 and 1.1 on a server.
A common finding in security audits these days is the failure to conduct all communications via TLS 1.2.