When I think currency, it always come to mind is
" Money" . A money that i need to give a comfortable life to my family and to be debt free. And I can see in cryptocurrency that will help to achieve it . I only have to be patient and work smart.
Truly, currency is a system of money for a particular country that could be used to live a life debt free. But as to comfort, that is always debatable.
Luxury, yes, but remember that comfort will always depend on a person's perception. Of course, many would say it's better to cry on a mercedez benz rather on a bicycle, yet a water bed does not guarantee you sleep.
And as per your view on cryptocurrency, do not wait too long for the perfect time, be part of the crypto economy activities, it will guarantee stable prices if not a peak of another all time high. Here, you can apply working smart.