It is sad to say, but most things that I do are for my own self interest. Better to ask what is something you have done in someone else's interest. Probably my last was that I gave a hat rack to a dr office. NSA on my part.
I like to keep abreast of the news daily, and I keep a log of what needs to be done weekly and daily so nothing is forgotten. It helps to be organized and to lessen stress.