Tax Avoidance Possible but in a few countries. Depends of your passport and residence too. For example Georgia - 0 fees on crypto income, but it can changed in any time. Passport - you should declare your income in your country of residence.
One of the option is: Come to the country where there are crypto exchanger (like Georgia - Tbilisi, i heard also there are a few in Turkey), send them crypto and get cash.
Anyway - the more totalitarian government (USA, EU for example in my opinion) you have the less chance to explain where did u get funds. The less "formed" government you have then easier to explain the source of income \ hide income
Even if you change the cryptocurrency in Georgia, it will not help you. If you want to buy real estate in Georgia, then the tax office may ask you for a source of financing.
The cash withdrawal limit from Georgia is no more than $10,000.
Cryptocurrency can be exchanged for cash without problems in most countries, but it is much more difficult to legalize income.
I don't think Georgian authorities would care that much about the source of your income when buying a house if you are not a tax resident in Georgia. Probably if you transferred money from a foreign bank account it wouldn't be a problem, but maybe it would raise some red flags if all the funding came from crypto exchange to fiat locally.
Nevertheless, traveling to countries like Georgia just to exchange bitcoins won't help at all in terms of tax liability, and could cause some problems as it'd look suspicious as hell.
The only solution would be to move to Georgia and stay there long enough to become a tax resident, assuming your home country won't double-tax you anyway. There are few countries, incl. US that tax their citizens even if they permanently live abroad.