Buying a coin because it is cheap is not a wise thing to do, the reason being that you might not know what the lowest price could be. It is possible you buy and the price continues to fall. So instead of buying with the price in consideration, buy the value. A coin with value will have good products. A product that is needed by investors and those who would like to use it. Although, you might be fortunate to buy it at low price, which then increases your chances of having more profits.
I think you can also check the value if the that specific coin is running for so long now and always have development and progress because it means that the dev and team behind it is still active. Hodl if the price goes down because it will definitely pump soon.