Portfolio to fiat without major exchange

I know a guy who knows a guy who had some luck with an alt and is thinking about taking the gains. Its 4x a decent input and while not wife changing its decently life helping.

Let's say one was to sell out their bag, convert it all to a privacy token let's say for this example XMR. How would one then go about converting that to fiat and withdrawing to a personal bank account/fiat system? He is NON US holder for the record.

Basically trying to implement as much privacy as possible here.

Asking for a friend btw.

Edit : I am = He is