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.
Very few people get to buy at the absolute bottom of the bear market, this is something that most traders need to understand, however buying close to the bottom is indeed very possible which is why people spend a great deal of their time trying to figure out if the bottom is already in or not, however regardless of the answer that we get it is important to remember to always take advantage of any drop in the price of bitcoin which brings it below half of its ATH, since at minimum you will be able to double your investment in just a few years down the line without too much of an effort.