As of August 25, 2022, Steam has updated its login interface for browsers. This causes that when logging in from a country other than the one of the account, the market currency is changed to the country from which it is entered automatically.
To prevent the market change from taking place, you must start from the mobile application for Android/iOS, or from the client for Windows/Linux/Mac. If you forcefully want to log in from the browser then you will need to use a VPN. You will only need to activate the VPN while entering from a browser, to play from the Steam client you will not need to have it activated.
We recommend you use PureVPN as it is one of the best and cheapest options out there. You’ll never have any speed issues with their servers.
The free VPN that we recommend is UrbanVPN since it has IPs from Argentina and Turkey. However, sometimes their servers can be very slow.