It is an important point to point out what you share here in your post.
Actually, if we look at the BTC movement since its beginnings, its price has been rising, with important corrections, which, as you say, is normal in the financial world.
However, the altcoin this year has not been very positively affected by the increase in the price of the BTC.
But history speaks for itself, and with the previous corrections of BTC, many altcoins have marked their maximum prices, ripple, steem, SBD, TROn, LTC, are clear examples of this. That in January 2018, after starting the BTC correction, they marked very good prices.
Let's wait and see what happens.
RE: Bitcoin and its sustained growth