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Most traders dont fail at trading because it is hard. They fail because they are not willing to put in the work to create a detailed plan, test the plan, and then follow the plan.
These traders for sure are just people who are thinking that trading is easy money or like a get-rich-quick scheme.
Strategy comes with work and time. You need to build your own strategy, practice it, and master it.
Capital preservation is the best also here because as long as you have the capital, you still can trade, and you can still apply your strategy.
That's why risk management strategy is important, like what OP explained with risk: reward ratio, that is working.
Precisely, I agree with your comment. It requires a lot of effort work, time, patience, and experience. If I would like to cover it all here it would take pages and pages. So I wanted to put just one of the perspectives on being successful in trading. And just having positive expectancy is not the magic formula but a crucial one.