Shorting bitcoin right now is playing with fire, you will get burned. Big money is investing into bitcoin now, corporations with billions of dollars in usd. It just takes Apple or Amazon to jump in and the price is over 70k and shorts get absolutely destroyed.

The market isn't always rational, meme coins like dogecoin have more gains recently than many cryptos with a legitimate usecase. So if your main goal is money, you should try to get in early on whatever will be hyped up next.