because crypto market is very new. it was born less than 10 years ago and the market stayed so small for 6-7 years. And then it started to grow up so fast that is why people made huge profits and started to cash out that is why market is still not yet recovered.
The price of bitcoin is volatile and not stable. Investors do not trust anymore in bitcoin, because they are not making any profit from their investment. When investors withdraw their money or convert to Altcoin, the price will definitely go down and that is the reason that people say that the market is downing with every passing day. It is normal now.