I would start and early version of the Coal and Steel pact in order to start European integration and make it to costly and difficult to have a general European War again—as was done after 1945.
Based on the perspectives of 1919 especially France v. Germany I would undue Bismark’s creation and reduce Germany to several smaller states unable to unite and placed under the “watch” of France and Britain to develop them economically—but militarily. I would allow for a German economic union but not a political one—again, if I was approaching these from the French POV in 1919.
