Do something fun! Something you don't usually do. Shake it up!
Take a walk in the woods.
Go to a shelter or pet store and visit the animals.
Sing karaoke.
Play.
Or work if that's fun – work on a project you put aside, such as a business plan or a quilt or woodworking project.
Go to a ball game with a friend.
It doesn't much matter what you do. Just break your usual patterns that are contributing to your depression.