There are lots of ways to easily convert or sell your cryptocurrency into fiat currency.
Find a buyer in your own place.
Find an exchange to convert your crypto to any fiat currency you like.
There's a lot of services already that could provide us to exchange our crypto to fiat currency just try to research them on the internet.
The method with a buyer seems to be a risky one. You can meet a dishonest person and lose everything. here are many good exchangers that are available for citizens of most countries. Just use the one, which provides the best rate.