Reach out to others. Random acts of kindness are fun and make you feel good inside and they don't have to be that complicated. For example, you could get a dollar bill and some quarters, go to Walmart and put a quarter in each of the gumball machines or the drink machines, hide a dollar in the toy section for a child to find and on your way out, if there's a donation machine for a local children's hospital, put whatever you have left in there. It's fun!
Here's the best list of random acts of kindness I have seen, it has 83 different ones!
Or just be kind to someone who lives in your home. Do their chore before they get a chance to, leave a note for them under their pillow, to let them know you love them. Pet your dog or cat. Get a bunch of fun things for your family, put them on the front porch, ring the doorbell, then run around and come in the back door as if nothing has happened. An act of kindness for yourself might be giving yourself a break on something, taking it easy one day or buying yourself some flowers. Just having flowers in your home has been proven to help with depression.