it took me a few killed buyins to learn, but i think the first time you lose a big hand that you kind of 'knew' you were beat in is a good sign that you need to walk away

keeping count of how much money youve donked/tilted yourself out of is a good reminder too, anything i can attach a dollar amount to tends to stick out in my head more

after every significant pot you lose, continually ask yourself if you played it as well as you could - if you dont think you did and cant offer any good reason why, youre tilting. and its going to be expensive

on the other hand, if youre getting your money in ahead and losing, theres not much you can do about those, theyre statistical necessities that will happen if youre on tilt or not. maybe just ask yourself if you made villain pay enough to draw out on you - giving cheap turns with flopped draws have probably cost me more than tilt in my last few sessions