I am not sure that day trading can bring you big profits, but I am sure that it will bring you very quickly fatigue, at least at first it will be too difficult, and fatigue can lead to more mistakes, which in trading equals to losing money. Medium or long term trending is more acceptable for me, I make most of the trades this way and only with a small amount sometimes I do day trading, but I do it not often, because it is tiring and brings comparatively small profits compared to medium term trading.
day trading is profitable for people that borderline speculating with high leverage, usually with 20x - 100x leverage, a slight price movement already results in either big loss or short loss, people are usually using that to keep them from wasting too much time, but of course it requires extensive knowledge and experience for anyone to be able to profit.
if you don't leverage then you will need big capital for your trades to be actually meaningful and can give you good enough profit otherwise if you use small capital then the profit will be really small too.
it's always the higher risk the higher profit kind of thing.
so if you think the profit is too small with day trading maybe your strategy is wrong.