Your tax office is mocking you:)
There is no doubt about that, but the law is like that at the moment, and when you are not in a position to change the law, you have to adapt in one way or another.
~snip~
I am sure that you also find a way out of the situation, but if the law is idiotic, then why is it needed?
In fact, there is a way and it's completely legal, and the law says that you can sell cryptocurrency in the amount of EUR 1000 per transaction without KYC, and there are dozens of physical branches where you can do it. Of course, all this makes sense for smaller amounts, while the question of the origin of the property can always be raised if your legal earnings do not match the value of the property.
In other words, I can sell more than EUR 5000 worth of cryptocurrencies every day, completely legally without KYC, and buy, for example, a house after a month - the problem arises if someone reports me (which can be anonymous), and then I have the problem of proving where the money came from.