Not that that crypto was a sure thing, for a long, long time. Everything that hyped it up in the start, are more or less dead now. It has been collectively decided that coins like BTC have little practical value, outside store of value. As I wrote in this thread, back in the early days the main attraction of bitcoin was mass adoption for daily use as a currency. We've long since moved away from that. What makes it valuable today, was only a part of the equation back then. And that's not taking in all the regulatory risks that were looming (not that they have been completely eliminated).
Likewise, for the longest time GPUs were mainly seen as a consumer product for graphics usage. Then machine learning algorithms started using them, and the rest is history. If you invested in Nvidia on the thesis that all they ever were going to serve were gamers, you likely wouldn't have foreseen the current price.
A more general and vague guess would be: Something related to data, AI, green energy, healthcare, etc. - look at our biggest unsolved problems, and then at the companies that are working to solve them.
It puzzles me how people see 10x-100x’ing their money on crypto as gods gift to humanity and a stroke of brilliance, but making the same amount by investing in NVDA seem like just another lucky stock pick.
If anything, there will always be the next FAANG startup, that will make one fabulously rich.