If we use fib retreacement for all big dumps in 2018 we see that price find strong support zones at 1.27 and 1.414. For last big move down 9992-5780 (Bitfinex) 1.27 and 1.414 lvls are at 4752 and 4170. Also at this zone lay levels 1.618 for 17200-9000 move and 1.414 for 11200-6700 move.