This has been keeping me up late at night. Too late, for too long.
I don't have a pathological need to win at investing, I just want to preserve savings and grow in proportion with my slice of the pie.

Currency moves are a real thing, but I don't think your goal warrants losing sleep : )
Very few things do. Heck, even serious tragedies are better with a good night's sleep.

The best way to preserve wealth is to ignore things that are designed to preserve wealth. Instead, own things that are actually earning money in real terms, which generally means equities (only occasionally real estate). Preferably equities that are earning money most of the time, and that aren't painfully overvalued so the disappearance of exuberance doesn't lead to a permanent loss.

If you do that in general the wealth will stick around, even if the market value bounces around. Profitable companies always bounce back from price dips. If there is a bit of currency diversification then so much the better. Pay attention to the revenues of the companies in question, not where the stock is listed or what currency the price is quoted in.

So be of good cheer! The world may have some serious cracks these days, but those with assets usually come out fine. Maybe that's not fair, but it is what it is.

Jim