No one can actually predict the absolute bottom, just buy in bit as the price go down, a lots of people are expecting bitcoin at 10k -15k as bottom but no one actually knows where it will bottom at, I won't be surprised to see bitcoin at such price because it seems like this bear season is going to be more brutal than the previous ones, imagine all the way from $60k+ down to 19k+ presently
Even if we can see the bottom, it will come in very abruptly. Only a few would be able to get their order filled at that bottom price. Most wont so don't waste your time keep looking for it, DCE around that price is what everyone should do.