You can upgrade your package or wait until the next bandwidth renewal date.
Dianahost Support ticket link: https://clients.dianahost.com/submitticket.php?_gl=1*l3hasw*_ga*MTE1NDI4NTA5LjE2MDY3OTEyNDA.*_ga_PLZGD4E5LZ*MTYxMTQ2OTQ5Ny4xMC4xLjE2MTE0Njk1MjIuMzU.