El Salvador is currently the best country which you can say that is crypto friendly . They are not only limited to being friendly, rather they also support the cryptos specifically Bitcoins.
But OP you can keep cryptos with you while you live or roam in any country.
You should thank to the decentralised nature of the Bitcoins for which, no government can control it and therefore no one other than you can know that how many cryptos or Bitcoins you have.
If you need to cash out of some Bitcoins, then do P2P deals. As easy as that.