What's Going on in crypto market.

Now Cryptocurrency market value/cap is : $218,481,325,400

But In this year, it was more than $800,000,000,000 .

Once a time i was also invested in ripple, and i sold all ripples . Rate was 2.88 usd per ripple .

And now the price of Ripple is 32 cent .

Bitcoin price also got down .

Some Person Saying that 2018 is the year of investing only . That's why all currencies price getting down , and it will rise again in 2019 or 2020 .

I am still confuse about that , sometime I also thinking for invest in some cryptocurrencies , Can anyone suggest me that which currency will better for invest ?