Panicking is one of the worst things you can do as an investor, when the price has fallen there's really not much you can do, the risk that it will fall further is always low, so it's unlikely that you will save yourself from further losses. People who sold below $4k must be really salty right now, as the price already increased by 50% from that.
We have been through MANY situations like this.
Why would that be the last?
So it´s just a question of TIME, soon or later we'll see green candles everywhere
To be honest, this is the first time Bitcoin experienced a global market crash, so it's not exactly the same as Bitcoin's own speculative crashes. But fundamentally nothing changed for Bitcoin, it's network still works, so in the long run this crash will have no effect.