If you must hold altcoin because they always bring better profits do not go too deep and make sure your altcoins are top altcoins
If you want to hold altcoins you must hold good altcoins because this will give you good profit especially when price of bitcoin start to increase price again. Because when bitcoin start to become bullish those reputable altcoins can increase also.
And always buy at dip price so that you will have advantage to gain more profit.