Investing in altcoins and meme coins are very risky, since it is more like you are gambling than investing. Diversification is very good because it spread your risk across several asset, but in this crypto industry, it's very risky to diversify because apart from Bitcoin, Ethereum and BNB their is no other coin to diversifying into because the rest of other crypto asset are all full of shit.
The only crypto to completely trust is Bitcoin, even the high rated coins like BNB, ETH, SOL, and others are not to be completely relied upon even though they have gain some reputation in the crypto industry, but diversifying on them is not a bad idea even though buying Bitcoin o would have been the best option.
Those people that bought several crypto asset and be hoping to make a fortune from one or two of them are just gambling with their money, because they are doing things based on hope, which is the same characteristics of gambling., not of investment.
Investing on so many altcoins with the hope of making big money from some of them is not working anymore, it was something that has been working before during bull run, but the crypto market is not predictable again at all, therefore, investing on so many altcoins thinking they will pump is the same as gambling because you never can tell.
However, if you have done your research and have conviction over the project, then you can invest in the project at your own risk.