What makes us so sure this situation is temporary?

I mean, obviously in the past we've seen some big ass bounce backs, and HODLing was definitely worth it.

But, what makes us so sure that it'll be like this every time?

I'm not selling, because I prefer the chance that it'll bounce back rather than having this money in my bank account, but what exactly promises us that this will definitely happen?

Not trying to be pessimistic, but who knows.

So, I need some hopium, what are the reason that make you certain that crypto will be back up and even higher than before?