Yes, a winter of 2-3 years is coming, if you don't believe this you will lose all your money, you need to understand how to play this game, holding is just a good idea if you really don't care about the invested money.
Bears are in control.
Nah, it's too early to say that we are in the bear market, of course the price did go down to $30k'ish but we have bounce back already and just above waters at $40,000. So it's too early to say that winter is here, there could be things to come in the next coming months and recover what we have lost this May and then some.
As for the invested money, there goes a saying "invest what you can afford to lose", so I'm sure many has taken that advise by heart.