If you're referring to Monero, can you explain how it's "designed" to provide massive increases in wealth for early adopters? Is it the volunteer contributions? Lack of ICO? Perhaps it's the fact that the current market price is lower than when the coin was released two years ago. That surely gives the early adopters an advantage....

There are plenty of early adopters who purchased Monero for several dollars each. And it languished at 30-50 cents for well over a year. And is now only ~$1.

So there's been plenty of time for anyone to be an early adopter....continuing through today and easily for months to come.

Or skip Monero altogether. Aeon, a related project is available right now for less than 1 penny. And has been for quite some time.

So, as to your question, Done. You can be an "early adopter" right now.

Then almost by definition such a cryptocurrency is doomed to failure.