If you invest in other projects unsure, I suggest continuing to hold ETH, which will bring you steady growth. If you can take some risks, I suggest that you invest part of your investment in ICO, which may give you a higher return.
I support this offer. If the guy has 69 Ethereum altcoins, it is much better for him now not to make any mistake (buy the wrong cryptocurrency). Hold your ETH as long as you can do it - up to two years.
Ethereum still has a lot of room to grow and make profit. However, I would still consider allocating a small amount to altcoins.