If I were a (benevolent) dictator: Abolish income tax, institute federal sales tax and property tax, institute a UBI that would cover up to the "poverty line" counteracting the regressive nature of the sales tax. Then I would start slashing government programs and increase the UBI to cover it (eg no more WIC or food stamps because you have a UBI). Maybe one day be able to slowly dial down the UBI as the economy rights itself from the last century of government-directed allocation of capital.
The first step on that path would be to allow government agencies to take any excess budget at the end of the fiscal year and invest it instead of counting it against their budget for the next cycle. They could use some of it to buy Bitcoin, and some to invest in interest earning securities that would help them with their expenses in the future. The interest earned would be counted against their budget for the next cycle, not the total balance of the accounts.