Latest POD for a harder-to-crack Third Reich

CalBear pretty much wrote the gold standard in 'monstrous Reich' literature in AANW, but did it with a Stalingrad POD. What are our options if we were to want to make Nazi Germany hold on longer than May 1945? In a meaningful way, that is - no Norwegian or Alpine redoubts.

D-Day going wrong seems an option, but bonus points if you can do a post-June 1944 POD. Even a few months more of organised resistance would be enough. Basically, make the situation collapse slower/later, and give the WAllies and Red Army more of a fight.
 
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