I think there are some altcoins that will grow like Ltc, Eos, Neo, and Ripple. many people who hold the coin can make a profit because we can buy at a low price now then sell it when the price goes up later.
If you look at investments for a long time, then these coins will be an excellent option, I would add to the list an etherium and of course bitcoin.
major currencies will be growing in value for sure. We already know how much were people willing to pay for them at their ATH, given that the industry is still evolving, there is no reason to wait for new ATH for too long