We are already in a bear market, keeping money is essential now.
Anyway, selling any of your cryptos when the market has a correction is a bad idea, just wait for it when it will be plunged again in the market, and if the current war of two countries was been a reason for this sudden dump it could be not the main factor of the sudden dump. That is not a world war and it is impossible to happen, other allied countries know that there will be an economic crisis when then there is a war.
However, if OP means selling his altcoins and reinvest in bitcoin is a good idea.