Apart from reaching a new ATH, bitcoin is also regaining dominance vs other alts. It was halved between March and June and bitcoin has been slowly regaining it but lately seems to have received a boost.

Source: (
https://coinmarketcap.com/charts/#dominance-percentage)
Any ideas about why this is happening?
Its obvious that bitcoins is tether to altcoins and other altcoins are created in order to compete with bitcoins since the price of other coins in the market is a lot cheaper and investors will have a variety to choose from.