For the government, make a policy to encourage more citizens to give explicit consent as organ donors

Make a policy that presumes every citizen to be a willing donor.
Instead of asking citizens to sign up as donors, the government can introduce a policy where, by default, all citizens are presumed to be consenting donors. However, an individual can choose to register their unwillingness to donate. Opting out of the default preference should be easy and could be completed in a click.

Ask citizens to check a box stating their organ donation preferences when renewing their driver’s license.
All driving license applications can have an option of “yes, willing to donate” or “no, unwilling to donate.” Make it a rule not to let any application with unchecked boxes be processed. Though this may result in fewer registered donors than a presumed consent policy, it may still significantly increase donations.