How exactly does the money making process work? You buy some cryptocurrency for a certain price then sell it for a higher price and the difference is the money you've made? This would mean that the money you've made is still in terms of cryptocurrency. Then can that money be converted into the whatever kind of cash your country uses? How does it work?
Trading or investing in cryptocurrencies doesnt work just like that,you need to do a lot of research first so you can choose which coins would give you a lot of gains in the future,you need to eliminate most of the shitty coins in the market,theres a lot to be consider like the coin's working product/services does it has any use to the real world? development team should be good so they can achieve their plans whether it is short or long term plans,this is not a buy and sell investment you need to familiarize how the market works,and how these fundamental and technical analysis can be a big factor to coin's price improvements,do not focus in making money instead how to learn things most of the basics things you need to know.
Converting your cryptocurrency assets to a fiat currency would be more easier when you convert your altcoins to bitcoin or ethereum first.