First of all don't worry and don't for a some time and don't trade, just leave it for 1-2 day and analyse the price movement.
Then if the price goes down to 30% to 40% buy in that dip as much as you want and this strategy works best for a long term investor but don't worry if you short term holder you can also buy in that dip because after the price dump also a pump happen which will pump it's price to 30% - 40% and then you can book profit. After this quick dump and pump market will become bearish and price going down slowly.
Then if the price goes down to 30% to 40% buy in that dip as much as you want and this strategy works best for a long term investor but don't worry if you short term holder you can also buy in that dip because after the price dump also a pump happen which will pump it's price to 30% - 40% and then you can book profit. After this quick dump and pump market will become bearish and price going down slowly.