You should always keep 5-10% of your net worth in gold and a little bit in other commodities.
Historically almost every time a major crisis happened, the price of gold went up.
Just look at the amounts different governments invest in gold.
There will be ups and downs but this was and still is the ultimate asset to offset the risk of a major crush.
Avoid risky brokers that will go bankrupt during a crisis.
Make sure the stop loss is low enough and the take profit is higher considering the huge spike in gold during the 2008 financial crisis.
I don't care if it goes down 10 or even 20%, I will always hold gold just in case something bad happens.
In the future something might replace gold but nowadays its still smart to keep 5-10% of your portfolio in gold.