Not necessarily. You could liquidate it slowly using peer-to-peer options, whether in your country or out of it. It's going to be a pain to liquidate whether it's legal or not, because you'll be alerting authorities if you move that much money at once, so slow liquidation would be advisable anyway.

If you plan to keep on making money with crypto though, it would probably be best to move, as you said. Belarus would be a great option, as someone else has suggested.