Going for cryptos instead of Fiat?

I wonder if I should go for those cryptos that might see another dot com/2k17 crypto like boom in 2019/20?

That is instead of concentrating on regular Forex/stocks/whatsoever.

If I keep an eye on them they should not be riskier than other Trading assets? While at the same time they still seem to offer such a huge potential to go up 2x-10x within a year or so. So if I traded my portfolio up anyway to counter a well possible devaluation in some of them, wouldn’t that be a no brainer?

So, why do I still got my brain? What am I overlooking? Why does it seem like most well experienced traders stick to regular forex?