There are really many experts in the US stock market, and there are also a lot of assets to study, with even more ways to play—some driven by fundamentals, others purely MEME types.

In the past, the crypto circle surged rapidly, and the cycles were obvious, so I wasn't very interested in other markets, thinking there was no need—just master one thoroughly.
I remember a certain investment guru once said: The benefit of studying different markets is that you won't recklessly buy overvalued assets because you can see clearly undervalued ones elsewhere.