Btc big problem for some time now has been continually declining number of new buyers required to produce an actual sustained rally. IMO the price is too unpredictable because it's too easy to manipulate. Wall St has already proven that they can take the price from 20k to 3k at will. This scares away a lot of potential players. If they somehow decide that btc should be 100 bucks then that will happen because there is no intrinsic value to btc to hold it up. Look at 99 percent of the altcoins as an example of what can happen to digital assets. Therefore it's impossible to figure out where the bottom might be.
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