I am more into cryptocurrency trading. It's much easier for me to trade/invest in altcoins that have potential and promising to rise. In the future, If I get a chance and got a good budget, I want to know more about stocks trading as I think it's needed more money for stocks trading compared to cryptocurrency trading.
I am sure that you will never need to know about stock trading as I'm seeing you are already doing great with the cryptocurrency trading. I mean only if you are not good with cryptocurrency trading in terms of level of profit making from it, you might need to think about switching over or extending your trading into stocks.
But, when you're investing/trading only with good potential coins then I believe you will never need to go beyond cryptocurrency trading. For example, I am comfortable with my bitcoin holding even I am making good profits only after years of holding and waiting; I guess I will never think about extending my investments into stocks. But, I may choose the real estate kind of the traditional investment as part of business and investment as well.