yes, you are late for the cheaper value for those top 2 coins. Bitcoin and ethereum, for this year, their lowest value was last april first week. Which the value for ethereum was 638$ and 6667$ for bitcoin. If you invested that time, you probably enjoy the profit for getting doubled your capital.
Yes that may be true for that particular references. But if you or anyone else see the greater picture of how vast opportunities are you or no one should get depressed. Don't narrow down what choices, there are a lot of potentially successful coins out there that may be as successful with bitcoin and etherium.
So why not invest in other coins?