If you had gotten in 6 years ago, you'd probably regret selling it all 4 or 5 years ago. Or perhaps you'd regret not selling, if the bubble pops tomorrow. Hindsight is 20/20.

On the other hand, I don't regret not gambling on Bitcoin in the last six years. It's an interesting technology but the price is driven by pure speculation rather than any significant demand.

meh, I got in 2012 and still regret not putting in more, spending too much time mining (rather than just investing), not having enough resources to make as much of a difference to my future, getting into Ethereum only this year, keeping other weirdo coins that are worth nothing now, etc.

If you got in 6 years ago, you might just have a different set of regrets and blessings.

I have the corresponding regret of wishing I got in six years ago instead of four years ago. Not that I'm doing bad now, by any means. It's just a relative success kind of thing.

You are still incredibly early to the space. Most people in the world don't hold any crypto nor do they even know what it is.

Many famous investors and entrepreneurs who came to Silicon Valley in the early 1990s thought they had "missed it." Everything up until now is a sunk cost. Operate accordingly.