Cutting the idea down to version one
Every founder's list is too long, and that is normal. In the discovery sprint we write down every feature, then sort them by one question: does the first user need this to get the main result? What survives is version one. The rest goes on a roadmap ordered by what users ask for after launch.
This is the single biggest saving in the project, often more than half of the original list, and it gets you to market months sooner.