Some people have known bitcoin since some years ago but they are still struggling. They are struggling not because they did not have money in the past but just because they are trading. They wanted fast money and they lost and lost several times.
You got me a bit perplexed there because it seemed you yoked investment with trading. Both aren't the same thing. Knowing about Bitcoin and still struggling being successful with it as you posited may suggest knowing and then just investing only. That's not in any way the same as trading it.
Fast money is not about BTC.
It's about knowledge and having a proper mindset prepared.