Well, if you are good at what you are doing then everything is profitable. If you are good at day trading you can profit from day trading, if you are good at long term investors then you can profit from long term investment. All you need to profit is to be good at it. How you become good at it ?
Well, you research on how to be a good day trader, you follow good day traders that profits, you pay for subscriptions and books and follow them religiously. After all of that you will still not be great at it, maybe decent but not good yet, because you need to trade and practice what you have learnt to become good, do that and in the end you will be good. Experience beats wisdom every single time, you can theoretically know everything about day trading but without trading yourself you will not profit.