It is not uncommon for crypto assets to experience a 90% downturn.  It's happened before and it will likely happen again.  Just don't double down or do anything crazy like take loans to try and catch the bottom.  It is quite possible this market too experiences a 90% drop, and if so there's still a long way down from 70%...  Brace yourself if you're going to hold, but make sure you're committed.  If you hold for a while only to sell the absolute bottom when it hits, you won't be doing yourself any favors.  That's why they say to only invest what you can afford to lose, that way you'll ride out the bottom.