It's unfortunate but that kind of stuff happens with all investments, not just cryptocurrency. I learned the hard way that the best thing is usually to hold and go long with investments. One day it's worth $3000 one day it might be worth $500...but usually if you hold on long enough it'll go much much higher.
I have seen it from bitcoin historical graph. The bigger the dip the bigger the bull run. But you will need a lot of discipline to hold.
Definitely. But having discipline is a huge part of investing wherever you go. It's been proven that a strategy of holding long is the best investment strategy.