Any investment is risky. You are safe investing in Ethereum. You can observe the market situation more, and don't miss the market situation. Or you can invest in altcoins you are interested in. Other altcoins are also doing well.
Treat Ethereum just like Bitcoin.
There are also some people who instead of buying other altcoins, just like having exposure to altcoins, intend to buy Ethereum altcoins instead of other altcoins. Because most of their bags are already in Bitcoin.