Altcoins are falling behind bitcoin as bitcoin has come out of the bear market so when will altcoins follow?

Is there like a pattern to this? If there is a bitcoin bull run then obviously altcoins don't go up at the same time however when bitcoin has a pullback in price then do altcoins shine then or when bitcoin pullsback to a stabilised price for a how long certain period of time before altcoins shine usually?

Can someone compare the patterns from 2017-2018 to 2019 now when it comes to altcoins?