Why don't you talk to your career center and director of your PhD program and see where other doctoral students who chose not to stay in academia went? I would assume that a doctorate in "foreign relations history" would be attractive to the State Department, Congressional Research Service and a host of other agencies, so start networking around DC. Or there are plenty of private high schools if you like teaching, but not at a university level.
Also, there are plenty of websites for non-academic phds. Yes, quant skills are generally helpful. Presumably you have good writing and research skills which are more useful in DC than most parts of the country.
https://www.academiatoaffluence.com/jobs-for-phds/