Huge profit will surely be earned once the market starts to increase but invest only on those that are promising. Investing would really be a good idea because the market value of most cryptos are low due to the continuous downfall from the beginning of this year, therefore, investors would be able to invest huge amount and hold. 
You should invest every time the market prices are dropping and that is the reason why you should hoard a huge amount of coins today, for those people who wants to join the cryptocurrency industry then this is the best time to do it.
It seems to me that we are still in a bubble, and the crypto still has a room to fall, the bubble was not in early 2017, when the ETH was $ 20. I am holding tokens from the beginning of 2018, and I do not even know how many times I thought that they had nowhere else to fall, each time they surprised me and fell to a new bottom.