Bitcoin is not too late to buy now, because many people have not even heard of it, which means that it will continue to develop actively for many years.
I don't think so. Bitcoin is getting more popular nowadays. Meaning, as it gets popular its level of interest will go higher. So many people will continue to use Bitcoin and sell it. So there is no such thing as too late in Bitcoin and in crypto. As long as you want to get rich and have a good investment, you can start now.