in some countries there is a lot of inflation with small or large numbers, but in my opinion it has nothing to do with the failure of fiat money because fiat is money that is used and controlled by the government so a good government will still maintain the exchange rate of its currency
Then you don't really know what is inflation, inflation is nothing more than the expansion of the money supply, for example bitcoin suffers inflation every year since miners mine new bitcoin every day, but this is a controlled process, but the governments just print as much fiat currency as they like and then they want to establish price controls which always fails, we have seen that story many times already, we know how it ends, and it always ends with the destruction of the fiat currency.
But do you? Do you really know that there are many definitions of inflation, and the expansion of money supply as you call inflation is only one of them, and a minor one at that? In the vast majority of cases people use the term in the context of rising prices, which means depreciation of the currency, i.e. price inflation. Typically, people who raise the issue of terminology, and especially in the case of inflation as monetary expansion versus currency depreciation (as you are far from being the first such) have nothing else to say apart from saying just that (which as they expect should give them substance and authority)
It is almost always clear from the context in which meaning the term is being used, so no need to show off here. In most cases it doesn't work as expected