Problem is solved. Private key is exported from atomic wallet. I have 12 words from that atomic wallet and algorand coins is accessible to withdrawal. I just forgot, that i withdrew algorands into atomic wallet and thought, that i used myalgo wallet.
Many wallets have 3 levels of private keys. First is usually 128 bits, seconds 512 bits and third (last) 256 bits. First is usually is in mode of 12 words (electrum, metamask, polkawallet etc). Some wallets have first 256 bits and 24 or 25 words. Algorand is example of such wallet.
Here this is explained:
I am almost sure, that myalgo wallet uses same method too, i.e. there is also 3 levels of private keys, including 512 bits key, but it just does not support importing it. But is not problem if user saved original words and remember which wallet is used. I just forgot, that i used atomic wallet. Sorry for so late reply, i have severe sleep apnea and just forgot to answer.