Most of my problems get solved by more plannng, at one level or another. Some problems get caused by too much planning: an outline that keeps branching out into subplots and sequels and prequels, instead of zooming in to actual usable scenes. But the solution to that, is usually to do more planning about the core scenes: timetable, which events need to be onstage, who all is present, PV character for each, main point or punchline, etc.

Then when I'm actually on the ground, so to speak, it all looks different than it did from the air; usually shorter and often better.