I have been in crypto space long enough to witness large price fluctuations, and I would not be surprised if we saw - say - 4k price, however I think that going from 20k in Dec down to 1k would be too much even for bitcoin. So I am very sceptical about your prediction.
Summing up:
- 4k - yes, we have seen such magnitudes in the past
- 1k - no, I am sceptical
I think Bitcoin is hard to come back to $ 1000 because the Cryptocurrency market is considered the best and most potential market. Personally I believe Bitcoin can only stop at $ 4000 as this is the price that many people want to buy the most and it is hard to drop to $ 1000.