You do not have to "be early"

Even if you are among the last people on earth to understand that you should buy Bitcoin, it would still be correct to do so. You get rid of fiat, which gets devalued over time and is not truly in your possession for Bitcoin, which is the best money.

Bitcoin's value priced in any fiat currency will keep going up in the long term until it reaches infinity, that is when the currency in question collapses. No one knows if this will happen during our lifetimes but it will inevitably happen.

If you are among the last people on earth wanting to switch to Bitcoin, it might be argued that you would already have seen said collapse. You would thus not even be able to purchase it with fiat money anymore.