Right now best suggestion for you is to go with the analysis yourself with different different coins , here I will not tell about any particular coin to invest , but still I would like to suggest you that how to choose perfect coins to make Investment and get profit .
First of all get best and famouse altcoins in the cryptocurrency Market and find out the most dumped coin according to the average value of the coin and then make analysis that at which interval of the times that price is getting fluctuating ( down or up ) .
And that will surely make you better to feel after Investment because if you will buy the altcoins at dump then Thier will be very less chances that coin will further dump .