Overflow implies a container that's already full, and most days don't feel like that. Sometimes what you have is a cup with something in the bottom, and that is an acceptable amount.
The language of these phrases runs hot. It can make an ordinary, moderately good Tuesday feel insufficient — as though being medium-grateful were a failure of enthusiasm.
It isn't. Quiet thanks counts. Someone who notices one thing and means it is doing better than someone performing abundance.
Lower the bar to something you can actually reach today, then reach it.