I adopted something like this a few years ago, except it was three things; not 10.
Ten things for 10 days is actually more difficult than it sounds; but three things every day for a month or more is harder. It was for me anyway.
Even so, it’s essential to be grateful for what you have and to name some of those things every day.
You can rest assured that there are a lot of people in the world who don’t have them.