I don't know how to cashout? I am from Romania, what are the possibilities to cashout a large sum of money at once?
In order to cash out, you must convert your altcoins to bitcoins and you need to make a bitcoin wallet. In my country we used here the Coin.ph to convert my bitcoin to national currency and then cash out. But I don't know in your country if what wallet you are using for cash out. I think you should ask for your friends who are resident also of your country.
You are lucky that in your country you have the exchange, the real problem is for those people who live in a country where either there is no exchange or the exchanges charge a very high value of the commissions, and this thing really demotivate you in trading. A good part of your profit is taken away by these exchanges. The best way to convert it into fiat currency is to apply for PayPal or Payoneer type cards so that you can get the money with less deductions.