You should feel proud of your achievement, so print out your certificate and post it where you can show it off! You've earned the recognition!
Indulge yourself in little ways every day, like taking a long soak in the tub, relaxing with a new book or going to a movie with a friend. You've earned it!
Revive an old hobby or find a new one. Sign up for a course, take up an instrument again, or try something totally new. You've got extra time on your hands so why not?