my first instinct when my son says he can’t do something is to say “ok do you need a break and then we can try again” 9 times out of 10 he’ll take a 5-10 min break get a snack and skip and hop around it refreshes his brain and he’s able to sit back down bouncing in his seat and complete it people just need to have patience not everything has to be done this second   if it’s something that can be done together like cleaning up i’ll offer a break then we can work on it together i break it up into little manageable tasks like you pick up all the books and i’ll get all the legos in the bucket we’ll listen to music and i try my best to make it fun screaming like a banshee and removing every privilege known to man won’t help