There is in fact nothing that prevent prices from dropping critically, but the consensus of buyers and sellers that makes the price could not be broken so hard that it would happen.
The price of bitcoin doesn't drop too low for now. And there's no way for bitcoin to lose it's value, bitcoin is becoming one of the best investments. This is making the market value of bitcoin and more investors are coming in when they are seeing the price starting to fall.
I don't think its going to go to a point when it will drop like before below 2k. With the current trend, we may even see the price not dropping below 3k anytime soon. So it will be a challenge for people buying btcs if they're going to trust bitcoin and buy at a higher price
I believe in bitcoin and i think that the price of bitcoin will become stable at $4,000+ for a long time because we can see that the price of bitcoin is stable in the past few months at $2,000+ and now it is around $4,000 and if we will continue to hold our bitcoin and hope for the increasing demand then the price of bitcoin will either continue to go to the top or just become stable at the current price range.