This is the reason why I keep my weekly rewards in Bitcoin as is so that if local currency will fall my funds are safe not unless I need to withdraw it for my needs. Dollar versus local currencies are on a rollercoaster not unless you are living in countries with currencies dominating dollar like Kuwait, Bahrain, UK and others.
I make sure to convert some of the satoshis to giftcards in my local currency. They are out of the investment pool that I am owning. That way I can pay some bills with the gift cards and not have all my coins as sitting ducks.
Unfortunately there is a huge taxation on crypto to fiat conversion in my country so I have to take this route for now.
It is part of the system and I think this is a risk we have to bear for some time now. Maybe one day it will become easier to exchange coins but not now.