This series of articles represents an attempt to summarize the top mistakes and omissions Germany made that cost it victory in this greatest and most terrible of all wars in human history. Of course, the best way for Germany to have won World War II was for it to have avoided fighting Britain, France, and the United States of America altogether. Germany had the military potential to defeat France and likely force Britain to make peace.
https://www.realclearhistory.com/articles/2019/10/13/germany_couldve_won_ww_ii_without_fighting_western_allies_453.html
https://www.realclearhistory.com/articles/2019/10/13/germany_couldve_won_ww_ii_without_fighting_western_allies_453.html