Have you said something nice to someone in the past day? Do so, whether online or in person. Make it genuine; wait until you see something really wonderful about someone, and tell them about it.
Have you moved your body to music in the past day? If not, do so — jog for the length of an EDM song at your favorite BPM, or just dance around the room for the length of an upbeat song.
Have you cuddled a living being in the past two days? If not, do so. Don’t be afraid to ask for hugs from friends or friends’ pets. Most of them will enjoy the cuddles too; you’re not imposing on them.