That's not how orbits work. After the 32nd orbit, Juno will enter its 33rd orbit. Orbits are inertial, and only require fuel for station-keeping. On this orbit, however, no orbital perturbations will cleverly keep Juno out of the worst of Jupiter's tremendous magnetic fields, which trap cosmic rays, solar wind particles, and other ionizing radiation, and so Juno's electronics will begin to degrade. No longer able to speak to us, Juno will keep orbiting until the orbital trajectory itself begins to degrade and it spirals down into the planet to burn up in the atmosphere.