For me its better to hold your altcoin, if you sell all your altcoins for now you can earn a very few profit due to its price declining, but if you hold it wait until price recover you will see a good profit.
I agree, I think if we sell the altcoin that we have, we can far away from the profit and we will reduce the balance without having a chance to make another profit when the price increase. for me, it is better to hold the altcoin and bitcoin in the same time and only sell when the price jumps to the higher price. we can wait for this and meanwhile, we can even buy more amount of the altcoin so we can have more amount in our wallet and it's ready to sell later.