I won't suggest all your crypto holdings at this point when you got plans to move out of your country, you just need to try cash out as soon as possible whether it's tax free or the necessary tax paid then buy bitcoin where KYC isn't mandatory then move to cold storage.
Tax is important with any company so make sure doing due diligent reseach about tax policy in your nation and hire a professional lawyer to do tax report for you if necessary. Saving money for it is not good, but only raises more risk to your business and yourself as a business entrepreneur.
About how to buy bitcoin and store it, even if you buy it on KYC exchanges, there is no prohibition on your action after a purchase. You are free to move your bitcoins from a centralized exchange to any cold wallet you have. It's freedom for Bitcoin users including business.
Cold wallets are best to store your bitcoins but make sure you buy a hardware wallet appropriately and choose a good cold wallet to use (non custodial and open source).
[LIST] Open Source Hardware Wallets[GUIDE] How to buy a Hardware Wallet the right wayCreating a cold storage wallet in Electrum wallet software.