When bitcoin drops to $30000, this is a disaster for most traders who buy bitcoin and altcoins at a price high. We didn't expect bitcoin to fall this low, so causing altcoins prices to be dumped very deeply. For traders who have already lost over 25% in trading, then it is best not to cut losses because it will make lose some capital. So believe me, the bitcoin price will back up again and altcoins price will rise again.
In a bear market sentiment, you can do two things. Either you just hold through the bear by becoming a holder irrespective of how badly hurt you're in regards to your portfolio or you use this opportunity as a backbone for trading and increasing yor portfolio size in regards to the numbers of coins you own.
Holding won't increase your coins quantity but trading would, seized the opportunity of the volatility nature of the market and buy when the market are low then take profit at the bounce in anticipation of another dip that you shall renter the market and secured your position.
Don't engage in this act if trading if you don't have the necessary skills in trading as it'll only end in more losses instead just hold and you'll be fine.