I don't know how to cashout? I am from Romania, what are the possibilities to cashout a large sum of money at once?
I dont know how it is in your country, but you can easily cash out with Coinbase or Xapo. Then another thing is that your may likely question how such an amount got in if you have never received close to such an amount before. Apart from Coinbase and Xapo you can use localbitcoin to sell to local exchangers and get it paid in to your bank. Make your choice