The truth often hurts, and while those statements may seem discouraging, they are the truth and we need to accept reality. Bitcoin is trading at over $100k and has a market cap of over $2 trillion, it is clearly no small coin and we are no longer in the early stages.
It's not too late to invest in bitcoin, but the idea of getting rich quick or getting rich with a small amount of capital is no longer true even if you hold it for the next 50 years, let alone 5 or 10 years.
Bitcoin can't go up by thousands of percent, giving us x100, x1000 profits anymore, let's be realistic.
It won't give such x's, but it's still the stablest and greatest coin, performance-wise too (even though, of course, it doesn't pump like a meme or so).
Surely, the early stage of BTC can be said to be gone, but we need to act with what we have at hands.