Hello, I can add a little something:
I have a system that's outlined as follows:
-RTH only
-Long only
-positions are only executed below the day's opening price
-positions are executed at predefined levels that I have marked myself. They are derived by my own observations. While there isn't anything fancy about what I'm marking, my own levels have given me the highest amount of confidence when it comes to clicking the mouse (which is really the most important part IMO).
My Reward to risk is 10 points to 4 points, and my historical win rate is just over 60% if I were to take a trade at every single level I mark.
I do try and add a layer of subjectivity to my trades however, which involves reading the DOM and order flow during the opening 3-5 minutes of the market open. I read that action and decide on a bias (whether it's a delusion or not, but again it gets me to click the mouse), and from there I will trade the levels that I see fit. I've laid my system out in the ES journal before as well, and basically nothing has changed in a very long time. Good luck!