I don't know the cryptocurrencies you want to invest in, i buy mostly BTC, and i do not have any plans of buying less of it, i believe the future is going to be good for bitcoiners. However, if you are buying pump and dump coins, you may have to sell it as soon as you have made some returns, and i can recommend that people invest less in new projects.
BTC ----> No doubt, must have
Altcoins ---> must be more and more selective, with its own risks. More returns, more risks probabilities.
so just take your own responsibility in choosing the right altcoins to have.
And it's true, diversification is important when putting our money in altcoins. Even if you like 1 coin, just bet on it, but don't go all-in, because you still need more money for other altcoins. Note: top altcoins .
For me, I'm diversifying some altcoins such as ETH, BNB, ADA, XRP, and other top altcoins that I have had since the previous bullrun. so, this is just a matter of waiting.