I think these two items are key:

That's because there is often a fundamental reason it is going up.

In the case of bitcoin, it is simply because institutions have finally decided it's a worthwhile holding and there simply isn't enough supply for them to all get involved.

Rising demand in the face of mostly static supply means prices go higher.

There's been a fundamental change with bitcoin and that means that just because it's up, doesn't mean it will go back down.

I think the game has changed.
So many longtime Bitcoiners and traders are saying this time is different
So many multi-millionaires and billionaires are getting involved,
Several large companies and other strong hands are involved,
I truly don't know how high it will go, but I am holding on for dear life!