I am the one person who, knowing the strategy, cannot focus and get consistently good results. And I also do not believe in anything other than statistics, double-checking the result, controlling risks.
Then I bet you need to pull your socks up 
Obviously, I haven't come across a strategy that has 100% win rate eevn with backtesting. Risk Management is key, but I will never be fooled into buying "already made signals"
if the signals are working, then why are they selling them?
it's just common senseThis all is similar to the match fixing tip scam that so many gullible people fall for in gambling.
That is why the way that I described is effective for me. It will not suit many and I do not impose it.
And tell us what is a very good, working strategy? 
(I have my own answer, and this is extremely important for me, but it is useful for me to know the answers of other people, as this is one of the keys to success in trading)
Nobody genuine will tell you a good working strategy, especially if you are an internet stranger. I have a good strategy that is suited for my trading style that has been working for a while, but I need to automate it as I have been missing lots of entries. (I have my own answer, and this is extremely important for me, but it is useful for me to know the answers of other people, as this is one of the keys to success in trading)