When I have some coin wallet or market showing RED signal I can't stop myself to buy a coin. But maximum time price goe's deeper. Lot's of time it's happening for me, maybe the same story happens to you.
So let's start discussing what factor need's to check like Volume, moving average, price history etc..
first of all you need to check the upcoming hard forks, and then you have to check the percentage of price increased per month, if this sounds profitable to you then you can invest on that altcoin. Also check the growth value of that altcoin.