The only policy that will increase savings rate is a stable or depreciating currency. People are incentivized to use an inflationary currency so they can maintain value.
https://www.macrotrends.net/1333/historical-gold-prices-100-...
What does equal value?
Another way to say that is that the dollar price of gold is correlated with the cumulative inflation of the dollar0 over time.
1900 $1 is equal to 2025 $172
So a single dollar today will buy 1/172 of what it would in 1900. That is inflation. Not an inflation adjusted curve. Just the drastic devaluation of the dollar.
The only thing to do is turn present day savings in capital, it's the only claim one can have on wealth in the future.