indeed this year Bitcoin has reached ATH, but not yet a new ATH,
Bitcoin must breakout from $ 19700 first, then altcoins will follow, all depend in the dominance of Bitcoin,
if dominance goes up then altcoins will have a hard to breathing
everyone is getting carried away by the good news that bitcoin price will go up, that's what makes bitcoin price going up even more, even when it drops a little everyone is racing to make big purchases because they believe bitcoin can reach a peak price of more than $20k by 2021.