It will happen I think when the dominance of bitcoin lower, because as many said the dominance of bitcoin is currently more than half of the whole crypto. For now it would be best to accumulate altcoins now because of bitcoin rise the altcoins got cheaper.
Keep buying as long as you have spare funds and you trust and understand the alts to invest your money, the market maybe isn't good for now but along the it will bounce and it will bring good value for our investment, we need to wait till the time comes and those alts will start to join and rally in inside the bull market not bitcoin alone.