If you think that there is some major economic turmoil ahead with dropping asset values across the board (and I personally this is fairly likely), the general advice is to aim for a positive alpha. That is, if you are moderately well off or better, invest to "go down less than your neighbors". Assets across the board lose value, but if at the end of the fall you preserved a higher fraction of your money to invest than your neighbors and are willing to pick the best assets after the collapse you can reap huge benefits.

The counter argument to this is that the above approach absolutely requires an iron discipline. And without experience non-professionals are prone to making very costly mistakes (e.g., invest on feelings, double down inappropriately, etc.). So, a general audience advice is usually: do not invest money you need within 5-10 years and do not make rash decisions; it is better to ride this train down and then hopefully back up than jump randomly. And diversify (across countries, economies, asset classes, etc.).

Just my 2c; not an investment advice!