Just some basic fractals and market cycle theory, related to how speculation and interest drives the market and how Altcoin bull cycles correlate t BTC movements. Pay attention to the Christmas holiday period and the start of the respective rallies in line with BTC breaking its previous ATH's.
In simple terms, cash flows from one area into another - in an observable trend that we have seen several times before. It would be wise to understand this psychology so that you can position yourself for it.