This has been discussed quite a few times. Check out the list here.
But a main thing to keep in mind is GDP is basically useless. [1] [2]
Really, just think about it logically. GDP is basically a measure of spending essentially. You say GDP went up 500%. If that’s so great, why don’t we just make GDP go up 1000%? We could do it over night. Current GDP is a little over $14 trillion. All the government would have to do is print a $126 trillion note, and then spend it on something. Bam. GDP is up by a thousand percent. Not kidding. Why he heck haven’t we done this already???