Nvidia was profitable all the time, sometimes profits were quite thin but it was profitable. Amd mining was negative from summer 2014 to summer 2015.
First wave of eth goldrush was the first half of 2016, that's when so called "ethbabies" were born. Second wave was first half of 2017.
You can also short (not zec), easy 10% x leverage daily, every 10€ yesterday is 15€ today with 5:1 leverage. Problem is that you need to know what you are doing.
So many different ways to earn some € @cryptomarkets.