Thanks for pointing me to the TL (which looks interesting), but that's having him die in 1935. What if he was never part of the Nazi Party in the first place?
He brought in a lot of support for the Party from the higher classes, and was instrumental in forming the
Gestapo and SA. Without him, the Nazi Party might be a lot less well-organized, and without their organization, they might never properly rise to power as anything other than a violent mob.
So, if Goering dies in 1918, Hitler's Nazis might not take power peacefully, but instead start a civil war against the German Communists or other factions. Germany would be practically crippled as an expansionist power no matter how this war turns out, should it get to that point.
Goering might be remembered in a similar moral light to the Red Baron, if not so famous.