In other words are Consistent, disciplined and Profitable trading the ES.
What would be the key point for your success in simple and few words.
Whether or not you are consistently profitable in ANY investment vehicle, be it futures, forex, equities, options, etc.., long term or short term depends on the same things:
1) You have created a working and reliable analysis model that determines your high probability trade entries as well as the expected target(s) along with your stop loss. This is the heavy lift that can take many years to develop, if at all. No shortcuts here.
2) You have the discipline to use that model accurately, plan your entire trade in advance, and see it through to completion without "winging it" based on your emotions or fears.
3) You employ proper account management where you're not risking too much per trade.
It also goes without saying you need to believe in the the work you're doing to create a working model, knowing the reality that the vast majority never "get it" and become consistently profitable. Have a plan B if it doesn't pan out within a certain time frame so you can keep moving forward in life.
Many people eliminate their chances right off the bat by deciding in advance what will and won't work. Some also feel entitled or obligated to "share" their misinformation with others as to what won't work. The truth is it doesn't work for THEM. It's their reality they are trying to project on others.
You need to have a truly open mind and reject all other opinions of what must or can't work to create a working analysis trading model.