It's always risky. For more than a year I was investing in BTC only. I wouldn't recommend it, but I can say my opinion. I think that it's a viable strategy.
its true that
BTC had been stable for a while now but investing a fraction of income into a good altcoin isn't a bad idea although I still feel that when it comes to investing in altcoin you should do it in a short term bases since most of them don't last long before finally loosing Thier value.
Your advice is good but you can do better. Bitcoin is indeed a very good coin when it comes to its steady bullish movements, resilience nature in this bullish season and its reliability as an asset. However, investors cannot make enough money in it compared to what the altcoins would offer due to its heavy size, which makes it wise to diversify our portfolio for better engagement in the cryptocurrency world. This is though an individual's choice, you will see some that would only invest in Bitcoin and shun altcoins, while some will do the opposite by investing entirely in altcoins and shun Bitcoin, while the last category would invest in both. In practice, I belong to the last set even as about 30% of my crypto asset is in Bitcoin and 70% is in altcoins. By this, I can't miss out on any of the benefits they have to offer investors, and I make sure that I buy many altcoins to avoid issues.
I plan it that way so that if one altcoin fails to deliver as expected, others will, and overall with the plan, it is sure that I will smile to my wallet accounts. This sounds like a good plan, and thus far, it has been indeed when it comes to the income generated. However, I can't entirely agree with the remark that altcoins can pump and dump pretty fast, that is not particularly true during its season. There are many of them that I purchased for more than a year and they've not disappointed me. What I realised here is that it depends on the coin/token we are talking about and your expertise in handling them. I started buying when they were low and somewhat worthless, which is best for investments. Even those I bought at relatively higher levels are performing well since this is a generally bullish season for cryptocurrency, both Bitcoin and altcoins would enjoy the benefits until the bearish season resurfaces which I believe should start in the second half of 2025. Needless to say, the altcoins season is still coming, everyone can still comfortably buy and hold their altcoins till after then without issues.