Well, I'd form a cult with her as the object of worship and me as the high priest. We'd form a conspiratory pact. The goal would be to form a private white nationalist army and topple the decadent democratic regimes of Europe via assasinations, RWDS and Star's most destructive magic. The presence of an actual, tangible valkyrie/goddess would be a wonderful morale booster. Following the defeat of the brown judeo-democratic horde and all its enablers we'd form a european empire with me as a figurehead.
We'd sign a non-aggression pact with Russia and switch to a labour backed currency and metals, all the while increasing military spending and creating a new Waffen SS. The goal would be to reconquer South Africa and create a neo-colonial empire, except this time with full genocide. The negro is to be delegated to the fossil record, and we'd have skeletons in museums and stuffed specimens in classrooms.
I'd revive the imperial cult, while the state religion would be a european brand of shaktism.
Finally I'd breed Star with a descendant of the Hapsburg dynasty to add legitimacy, and the child would be the future emperor/empress.
I'm pretty sure there's room for foot fetishism and anal somewhere in there but that's beside the point.