There is no bureaucratic governmental labor-intensive process that "just needs funding" to expand instantly. They also need time & multiple experience/training/improvement cycles.

This is especially true in foundational processes where, in some cases, the slow rate of change & large involvement of many competing groups is part of its institutional legitimacy.

Oregon's system was incrementally expanded for additional, and larger, elections over 15 years: https://multco.us/elections/brief-history-vote-mail-oregon