Some altcoins is huge pumping who's bought in a month ago, they already got profits 3x-4x in some specific coins likes SOL,MATIC & TON coin. But i would like to recommend BTC to collect in your bag, BTC is guaranteed investment if you can hold for the long term. If you’re interested to altcoins then choose top ranking coins.
No matter what with these altcoins pumping as much as they can, it should be recommended at all times to buy bitcoin. When people don't realize the power of stability of Bitcoin as the leader of this market. You don't have to be worried about the entire market because it moves the whole of it.
Whilst for these altcoins, yes they may pump as high as they can but you'll never know how it will be. So, if you're going to collect altcoins, do not hesitate to have Bitcoin first so that you're doing the right thing and then next is altcoins that you like.
Many think Bitcoin has already an expensive price to engage themselves, the reason why they're looking for alts that can give them huge profit once the market turns bullish. Well, there's nothing wrong if you'd like to diversify but just like what you said, it's best to prioritize holding Bitcoin since it is a profitable investment even it might takes time to profit. Then, you can fill your bag with altcoins of your choice. But much better to choose an established coins because they have real use case and not just a pump and dump coin relying on hype.
Nevertheless, investing in alts are risky therefore as an investor, we should be aware of this before doing so. Dig deeper to become certain that the specific coin is worthy to add in your portfolio then timing when to buy.