Well if you read this post, i think you already heard this stuff, know about it, so I skip the introduction. I have just some comments on that.
Figure 1. Sample bitcoin stock image for online newspapers with a title "BITCOIN BURNING"
Maybe by chance, maybe from advise of a friend, maybe even by knowing by heart about the blockchain technology, a small percent of world society has own bitcoin before it was cool. That does not directly imply that they are good at investment decisions.
Money is just started to flow this zone, so it was nearly impossible to lose unless you do a very aggressive investment or any kind of silly decisions. Nearly any "investment advice" in any kind of cryptocurrency/token probably worked "fine" in 2017. Really, I have seen very garbage projects without an MVP and no related activity with blockchain infrastructure. Even they gave very huge returns to the investors in a very short time. Soon, probably sooner than we think, even good projects, good companies will fail catastrophically. (like in "real world")
So if you want to be "all in", try to learn how it works (both blockchain and exchange dynamics), how it should work.