Be very explicit about what good behaviour you are thanking them for.
Keeping up that positive praise moment after moment, day after day, is difficult. But in our experience, it will have an effect.
Ask your child for ideas on how they can calm down when they need to. Include your own calming down strategies. Show them we all need to manage our feelings sometimes.
In a busy family, often when tensions run high, we press each other’s buttons. But that’s not showing your child the best way to be. So pay attention, if you can, to also notice, recognize and thank each other for anything.
Sometimes you may feel, “If am going to catch that one being good I’d better not blink.”
And that’s okay.