Not only two coins that make us rich, if we have lots of quality and potential coins, but we will also be rich. Managing coins is not as easy as we thought, so to make rich management right is what we need.
I may say that it can be, only we need to put a huge amount money but the risk is too high rather than of having a numbers of coins.
If we can manage to take the risk, then it will be depending on us. Investing with Bitcoin and ETH will probably can make it as it shows to be the most profitable coins in the market.
Today, few people can believe that a cryptocurrency can greatly increase the price. Many can not imagine themselves such a huge percentage, which were in 2017. But they were, and it is likely that there will be in the future. And this will be the growth not only of bitcoin and etherium.