> average annual return of 350%
That's misleading. The price is currently at the ~35-40% retrace from the high of 20k. What happened so far (for example the rally to 20k) is not an indicator that Bitcoin's value will grow or even be sustained.
I'm not saying Bitcoin doesn't have speculative value, but you have to be already an experienced analyst and trader (in case of day trading) to have a chance at profiting from it. "If it were easy everyone would be doing it" proverb is true. Crypto is much harder than forex for example. Again, unless you really know what you're doing, trading will hardly be more profitable than going to the casino.