The best trick I know for "improving affect" is very counter-intuitive. Think about something good that happened to you, and really changed things. Now imagine how much worse your day (or your life!) would be without that event. Ten seconds, and presto! Your mood improves!
Edit: Affect is a noun. It means "the way you feel", and the inflection is on the first syllable. https://en.wiktionary.org/wiki/affect#Etymology_3