The most profitable trader here was spanish89. Read his journal and try to reverse engineer his trades. I did
One of the other considerations here is starting capital, etc. It's a much different risk profile trading a 6 or 7-figure account vs. $25k. And as someone else mentioned, define "daytrading." I take a lot of daytrades but I may keep positions overnight or even a few days, if warranted. And are we talking about trading futures, options, ETFs, Fx?
Day Trade I'd say 2mins to closed on the day, Scalp being Sub 2mins. Over Night is a Swing trade. Quite a lot of my trades fall into Scalp recently.
Day trading is profitable for those who do rigorous monitoring of the forex market. It requires much discipline and experience as a little change in price can lead you to profits/losses. You can make a trade journal and review your trades. This will help you to rectify your errors and then you can work on them to do better day trading in future.
Probably not a "single one" because the "show" is not what *you* think. Most people think it is just a system with signals etc. That is only part of it. The other parts, are scattered around in other posts. To understand what makes a good system, you need to understand what are the parts of the systems. If you identify all the parts, then you will have a road map to the parts you need. Then you need to figure out how to put them together. It is like preparing a multi course good meal, there is a lot to understand. For starters, a system is needed, but the truth is many system can work, but the actual tactics to implement the system is where most fall down. Hope that helps.
You can work hard for it. Keep practising and learning different aspects. The only way to earn more profits is by working hard for them.