Stop losses and risk management.
I think you are the right experience is one of the most important things to maintain this market, it can not really be easily achieved by someone but if they are not sustainable to do something for the long term. Just learn things along the way and this is how the true characteristics of a trader.
I have met many traders who make it as live and meet them in the forex market I do not know if this merchant is indeed in the crypto market but I think there will be people involved in this matter.