Probably because whenever it goes slightly up everyone sells it because they think the Bitcoin fad is done and it will never go as high as it was in the previous years. Also, it might feel like it's not controlled by whales sort of control the market.
Don't think in a different way because the price of Bitcoin will increase in the market for sure but now it is facing many issues with the price. As many people are thinking in the same way, now Bitcoin is in complete consolidation state which it may increase even higher value in the market.