Here's some advice from a guy who has been studying, investing and developing Blockchain projects since 2010.

"Don't sell," Don't sell, the value may go to zero, but the project behind each coin you're invested in, whatever it may be, won't disappear overnight! That is if it's a serious project! And all Cryptos are below BTC. Here are four graphs from different years. Do your own analysis. DON'T SELL!!!!!!!! My first BT cost R$$ 800 in 2015.