Do you mean that you should change your altcoin portfolio depending on the trend that is happening right now?
What if your last portfolio assets are worthier than those new coins or tokens?
Be wise and not only follow the hype. The hype will be bigger, very big enough. But most hypes will not survive for long. And once you get it, you may regret changing the assets to the new one. We can exactly add some to our portfolio with the new hype coins, but not for long term. And you must also know the right time to sell again the coins in rderto get the profits, not being dead coins again in the wallet.