You can either sponsor jsDelivr with your services or with monthly donations. For example, to become a Bronze sponsor you need to either sponsor a service worth $150-499 per month or simply donate the same amount of money towards the further development of the project. If you are a company then you can also donate development hours of your coders towards improving jsDelivr. Just send us an email if you have questions.
For companies that want to offer a smaller or bigger amount than the one listed above and/or has custom requirements from jsDelivr.