How do I stay level after big trading losses and tilt?

You have done the deep work already. Most traders never learn to manage their own minds, and you have. What still gets you is the extreme: the big loss that stings and the tilt that follows, when one bad outcome pulls you toward a worse decision. That the edges still reach you does not undo the ground you have gained. Tilt is not a character flaw; it is your nervous system reacting to loss as if it were danger. You cannot think your way out of it in the moment because the thinking part is offline. The answer is not more willpower. It is a rule you set in advance, when you are calm, that takes the decision out of your heated hands. Write one rule now: after a loss past a certain size, you step away from the screen for a set time, no exceptions. Decide it while you are level, so your calm self protects your rattled self. The big losses will still hurt. They just will not get to make your next decision. Let the rule hold the line when you cannot.