Or you decide the winning move is not to play, because borrowing is expensive, the purchasing power of your Benjamins won't diminish if you bury them in the ground, and investing money on capital goods in the hope of accumulating more money has negative average risk adjusted returns if there never is any more money in aggregate. On the other hand the way you capture the share of the growing pie is by increasing efficiency, it ceases to be an adequate investment strategy to just hold your capital in uninvested currency.
And taking a graph like that one where the sharp fall in productivity growth starts a couple of decades before leaving the gold standard and actually stops falling afterwards as evidence that leaving the gold standard caused productivity growth slowdown is peak gold bug dodgy graph interpretation! Bretton Woods collapsed because it was inherently unstable anyway.