I prefer to invest in already established coins rather than new projects, especially the top 10 coins. And it is better to buy the coin when its very low, because you are very likely to make profit whenever there is a pump.
It is a safe investment option in this market. You will never lose too much if you invest in the top altcoins in this market. But you also won't have too much profit when the pump arrives, so you need to choose altcoins outside the top 10 to increase your chances of making a profit.