The current process for citizenship renunciation often requires an in-person visit to swear an oath at an embassy or consulate. This could be streamlined by creating an online process in which individuals could complete a basic form (&/or video) with identifying information. As an option, though it may not be necessary, that person could then be provided a pre-paid, pre-addressed envelope for returning their passport, social security card, etc.
The entire process could be hosted under a simple website domain such as: renounceyourcitizenship.gov
Current relevant links: