I think this is impossible. Bitcoin never returns back to dip price it tested in former rallies. I would expect bitcoin to drop somewhere around 25000 maybe but not anything below that level. Bitcoin is very popular all around the world now so noone would allow it drop that levels anymore.
No, it's never impossible, just look what happen before, if we are in the same situation last 2017 where its bull run and bitcoin reach close to $20k and we are ask if it could dump below $4k, of course the answer is impossible, but it did happen, bitcoin dump that low, therefore the possibility is always present.
Just a sample.
$20k to $4k./.. 20% of its ATH
$60k to $10k 16.67% of its ATH.
The figure is not far.