So if you have more coins than you are comfortable parking on an exchange (essentially, any amount above zero for me), and you wanted to go to something with low volatility for a few days/weeks/months, what would be your choice?
Obviously, it all depends
I think there is a big difference between time spans like days, weeks, and months. As to me, for short term packing, the US dollar seems to be perfect (or US Treasury bonds). It is totally liquid and accepted everywhere (that should go without saying). But if you want to park your wealth for longer terms (say, up to a few months), you should evidently look into gold (US Treasuries should do just fine too). You don't necessarily have to buy metal gold, you can instead buy gold derivatives like gold ETF's or cash-settled gold futures, and you are pretty much done
I am thinking Treasury Bills, bonds and ETFs would entail lot of studies and getting used to, but we can without much ado also achieve low volatility and stability with a cryptocurrency like Dogecoin. Presently it is very low and thus present not just a safe haven, but also an opportunity for huge profit making, when price rallies again.