A 80% drop in BTC from ATH is at 12k A 90% drop in BTC from ATH is at 6k The return if you buy BTC at 12k and it goes back to ATH is 5x The return if you buy BTC at 6k and it goes back to ATH is 10x
Looking at the BTC levels Dec 17 to Jan 18, I believe that we have now a similar pattern formed (Dec 21 / Jan 22) and we should expect at 40% in BTC price.