Markets already crashed, I doubt neither cryptocurrency nor stock market could go much worse from here. All you have to do is invest into companies that lost a lot of money but have a fundamental reason to stay longer. For example Warren Buffet one of the biggest investors of our age invested into coca cola after a big market crash. His logic was simple, yes market crashed and economy is not doing well however that won't stop people from buying coca cola in the future, so he bought it and we all know what happened afterwards.

Same applies in today's world, if you invest into companies like apple, amazon, maybe even coca cola still, and for crypto into bitcoin, ethereum, and even litecoin there is a big chance that after all of this is said and done people will continue using those things and the value will eventually increase, you have to look at it for a long term profit instead of short term gain.