He was not politically inclined and unless he avoids this traumatic brain injury he will likely be disabled post-war. One way he could potentially butterfly Hitler is removing Goering from the picture; Goering took over Richthofen's unit after he died, so got a lot of press and notoriety. Being a minor Bavarian noble his war hero status, fame, and social position got him access to Hitler AND elements of society in Bavaria that Hitler had trouble accessing. Goering was a significant part of the rise of the Nazis party, being the President of the Reichstag before Hitler even became Chancellor. No Goering affiliated with the Nazis or having the status he did historically could well keep Hitler from power and the Nazis from becoming what they did IOTL.