but what I'm surprised is that all the popular Altcoins in the market have not reached their new ATH after having reached it together with Bitcoin in the previous 6 months. What do you think this is affected by ? so Altcoin looks very difficult to increase now
I have also noticed that. For over the years of having bullrun and bear market, investors have realized that its BTC will always have value, and altcoins are often going to be inferior especially if you only hold a few.
Some altcoins have not even breached their ATH since 2017, it's just that if an altcoin has POS, most of the holders who stake will sell every now and then the tokens they earned from staking. Even if the altcoins have usecase, they will not gain investors unless they really have the marketing as well.