There just are not enough sellers left to push the market down in any meaningful way.
So let’s say a lot of weak hands sold already at $20k or when the price reached $30k, just because they thought a big correction like the one from 2018 would follow. Of course, they made a mistake and many are now out of the game, while on the other hand institutional investors have been buying (and still are buying) large quantities of BTC and storing it in cold wallets with the intention of a long-term investment.
I would not agree that the difference in price of almost $15k is not something significant (from $42k to $27k), and these are corrections that have happened in the past - now only the numbers are different. Nonetheless, we should not forget that we are in the year that came after halving, and such years have always been the best in terms of price growth.
Considering that it is more than realistic for the price to at least double by the end of the year, why sell now when only with hold everyone can profit.