It’s pretty obvious at the end that there will be at least one more game. Here’s my idea-
Kratos and Thor have their little battle, Kratos is mortally wounded, Thor thinks he’s dead and kidnaps Atreus. Days later, Kratos awakens in Tyr’s temple, where Brok and Sindri have nursed him back to health. Kratos, Mimir, Brok and Sindri then travel to Asgard to save Atreus and defeat Thor, while being pursued by Freya.
In a third game, Thor and Freya are both dead, Atreus is saved, and the company take the fight to Odin during Ragnarok. Odin has resurrected Baldur to kill them—which doesn’t work—and Atreus unleashes his Godly power and kills Odin, but also Kratos at the same time. Ragnarok happens, and the world is born anew, with Atreus as the God of War.