Complaints are loud and gratitude is quiet, so you have to go looking for the quiet one on purpose.

Complaints travel further than thanks. Annoyance is urgent and wants company, so it gets said at once and then repeated, while something good gets registered privately and dropped. The balance in your head is therefore not the balance of your life; it is a record of what got spoken aloud. Correcting it takes deliberate effort, because the quiet side never volunteers.

Go looking once a day this week, at dinner, in the car or before you sleep, and name one specific thing that went right. Specific beats big, because the point is to give the quiet side the same airtime as the loud one.