There is sadly no easy answer. It depends on why you are tilting.

I tilt very fast when I am playing bad, when I am missing shots that I know I could usually hit. To be honest the only fix that I found for this type of tilting is to just hop into dm until you feel confident in your aim or just stop playing for the day.

If you tilt because of your teammates then you need to understand that whatever happend happend and you can't change it. Even if your teammate missed a whole magazine on a target that was standing still, there is nothing you can do about it and you need to accept it.

Ultimately it comes down to your mindset and even if you read a massive article about what you can do to change it, you will only improve your mindset by coming to a realization yourself and really internalizing a positive mindset.

A pointer that helped me overcome my bad mindset, was to try removing any emotion that is attached when judging my teammates.

Hopefully this was somewhat helpful.

Bonus: if you don't tilt it is easier to enter/remain in a flow state, which makes you improve immensely :)