Cashout $750,000 to Swiss bank

Use Revolut.

Brief case

Cash

call them and ask them if they would accept your tax payment in cryptocurrency.

For 750k lol, I use Revolut but only to pay for things not to store my money

Then Go Speak To a fucking g lawyer and stop with your stupid shit posting on here.

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localbitcoins, cash to local currency?

You can open bank accounts in almost every country online.
No need to be a resident either.
Most first world countries offer bank accounts that'll open accounts in different currencies.
Try Canadian banks, they your fren, fren.

Local bank will ask for proof of origin, and as OP says, if he utters the word "crypto", the local bank will either:

a) reject the deposit - not so bad

or much worse,

b) accept the deposit and then (conveniently) close the account afterwards, because of aml policies.

there are crypto friendly banks in the us. It would be easier to advice the op if he provided his country