Macroeconomics is very far from perfect but we do know how to stop, or manage inflation. You can stop it by keeping the money supply stable (don’t print any more money than necessary to account for notes and coins wearing out it being lost). You can have constant low inflation by targeting the growth rate of the money supply (like the EU’s near but not at 2% target).

That’s it. Plenty of countries don’t do that but it’s a matter of political will/popular support for ending inflation, not a technically difficult problem. At worst you can just adopt another country’s currency like Kosovo has the Euro or Costa Rica has the dollar.