Maybe if you are using direct p2p, it is possible the interest can be up to or more than 20% depending on the agreement between you and the buyer or the seller. If you are not bothered about your personal information, binance can be the best option for you if you want to exchange bitcoin into fiat because it is zero trading fee. If you move to a country binance is not supported, you will have to make use of another exchange, no option than that until you returned back to your country, I will not advice you to use VPN, or you can contact the binance customers care first to know if VPN will be allowed in such case.