How far is WWI being delayed? If long enough you could make it so the Russian Revolution begins in peacetime meaning Russia cannot commit to the Entente at all. Obviously you'd have to remove the bit about Nicholas II reforming the Duma and instead make him make even dumber decisions to feed the people's outrage. Having this massive number of troops on the Western Front means the necessity of invading Belgium can undermined with the sheer numerical superiority of the Germans vs the French. Have Germany mediate a plebiscite for the Italians in Austria-Hungary to choose who to side with, I would assume they would choose Italy, removing the only real offer the Entente could make Italy that would be worth more than say Tunisia or Algeria. Have the Quadruple Alliance further placate Italy by promising them Egypt and Sudan if they stay loyal to them. Without an Eastern Front and an additional theater in the Italian front the French cannot withstand the German offensive, even without a surprise from the Ardennes. The British, while not happy with Germany's growing power, would most likely join France even if Belgium was untouched but I doubt the BEF could make enough of a difference to tip the scales in favor of the French.
The Entente would be kinda fucked if Russia falls into Civil War before the war even starts, there really is no way for them to win in Europe and even Africa could become a contentious front if the Italians do a good enough job. The British would be forced to get the Americans to help them as there just isn't any real power left without France AND Russia.
I'll mention anything else if it comes to me
