I would not rush to invest and sell bitcoins in exchange for altcoins. I am sure that Bitcoin will continue to grow in price earlier and at the same time, Altcoins will be cheaper in relation to Bitcoin.
As a result, if you wait, you can buy altcoins even cheaper. So think and only then make a decision.
Some altcoins might be good for your investments but if and only if, you choose the right ones. Right ones are difficult to find, you need to do your own research and not rely on other's opinions. I still prefer bitcoin as my major investment. You can never go wrong with btc. But it is your money, so you can do whatever you please. Just make a smart decision when it comes to altcoins.