“Joy is the infallible sign of the presence of God.” — Pierre Tielhard de Chardin
This is what Jesus was talking about in John 15, about abiding in His love so our joy will be full. A branch that is broken on the vine can't get all the nourishment that it needs and starts to die and wither. The same with us, unless we are attached to the True Vine and taking in His love our can dry up.
Stay in His love. Share His love. Your joy will grow.