Ok here we go.
Your divisions are out of supply all over the front.
Some only have 8% supply. So they cant fight and shoving more troops to the front only make it worse.
Only lvl 2 railways at some places only lvl 1 = not enough supply...
You lack trains and convoys so even less supply. (don’t know were the 258 convoy are needed the 20 divisions in Syria should not need so many...)
You are in 1944 and only have 250 factories
Germany alone has around double of that all the minors combined even more
You are short on many things and need
more artillery ( 380 days of production)
much more Support Equipment ( 600 days of production)
double the number of medium tanks ( 700 days of production)
and also trucks even you dont motorised the supply of the armys yet.
You have 15 factories on medium tanks while you have 10 on rocket interceptors (wich are crap by the way)
Some of your templates are real bad
You already have 639 Divisions and have clocked up 264 more which are waiting for equipment.
They are also set to infinite new cycles while you even cant equip your current troops.
Also none of your divisions are fully trained. some are even green.
That is some things i noticed for now and im sure there will be more.
Try to fix this and then do it better next time.
And why you play ironman if you are not knowing what you are doing.
Good luck for you.
Watch some strategy guides at youtube or read some tips online.