You know USA has a defense budget about as big as the next 10 biggest military budgets by country combined.
F-35 is made in USA, and even they can't do what you are asking. Having unused production capacity cost money, and yields nothing.
This situation with Russia is completely unheard of since WW2, which ended 79 years ago!
You claim we should have prepared better for a situation everybody tried to avoid except Putin, and almost everybody frankly thought was unthinkable today.

Instead of the insanity you promote, we for instance created EU in Europe, with a specific purpose to help prevent war in Europe.
We have managed to keep the peace on our side, it's only the former Warsaw pact side that has created problems, because they did not have similar goals ingrained in the cooperation between them.

What you propose is one sided heavy military build up and preparedness, and that has historically always ended in war. Warmongering is not a way to keep the peace.
But now we DO have a war by Russia at our doorstep, and we commonly agree Russia needs to be stopped now, or else they will continue.

But that doesn't mean that what you claim we should have done about weapons production was ever justified previous to this situation. Not even when viewed in hindsight. Europe is a force for peace, but not under oppression from Russia, which is a major reason why we help Ukraine.