Is there any point in ETFs or bonds if this is long term investment?

so the title says it all, if you are putting away money each month, which you can afford to lose should it all just be into bitcoin then? I am starting to get the impression that the S&P 500 or simply diversify into bones is not worth it if you understand, bitcoin how it can change the world and your finances. if let’s say you put away 100 pounds a month into investing is there any point of allocating those 100 pounds or any bit of it into anything besides bitcoin? The goal is to hodl.