There are hundreds of options. I'm just gonna focus on ETH now, I think it's a solid choice.
Much better choice to stick only to one or to a very few of it where you'll be able to feel the true impact of the volatility and price movements.
Because if it's too scattered in so many altcoins, and you only have got hundreds to invest. There's still some gains but the impact will be little because the other altcoins that you might choose could be dropping.
While some of yours are pumping. That's why this is a sound plan and as no argument needed, ETH is one of the best choice.