The move in altcoins are done with the positive high move in bitcoin. This has being the startegy or pattern before now. With the uncontrollable increase in the price of bitcoin, all other altcoins are at advantage to take the same move. But when there is a slight drop in the price of bitcoin, there goes the market on red.
With the interest of Tesla who made a very huge purchase of bitcoin in the market recently has also affected the crypto space positively, making more room for altcoins to see new highs. With new and big influencial people in the crypto space, financial bodies letting in the use of bitcoin, then altcoins are gonna have a good time.