In the world of trading, it's never too late, if you understand how it works.
Speaking of investment maybe yes, you are too late to do it, you should not do it now, when the price of cheap Bitcoin 2018-2019 is the right time to do it.
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Trading and investing isn't the same thing. There is no such thing as being late when it comes to trading. You can trade anytime. Buy low sell high in short period of time.
Investing and holding is a whole different thing. And you are wrong here. It's not too late to invest. You are saying he shouldn't invest because the price isn't as low as it used to be back in 2018/2019? Lol, of course it isn't. You probably will never see that price range again. The price is once again low, and now is the best time. You don't want to be regretting later and you probably won't see the $30k mark after few years.