Unfortunately what you refer to as a “problem of currency losing value” is a feature for a government, not a bug. They want this because it allows them an additional path to taxation by diluting all existing holders of fiat.

The only way to prevent being diluted is to not hold fiat and end up in a situation where it is held only by government beneficiaries, i.e. that the government is inflating to pay people affected by inflation. Then their ability to inflate is de facto obliterated.