Cut the scope
For when the project has quietly doubled.
Here's everything I planned to build: <paste the list> Time available: <honest number> Cut it to what actually fits. Specifically: - What's the smallest version that still delivers the core value? - Which items are I-would-enjoy-building rather than users-need-this? - Which could be done manually by me, for the first fifty users, instead of being built? - What can ship visibly unfinished without embarrassment? Give me a "version one" list and a "later" list. Be ruthless with version one — I'd rather argue with you than run out of time.
"Could I do this by hand for the first fifty users?" removes more work than any other question. Most admin features are a spreadsheet until they aren't.