When going to science fairs and competitions, I often see people spending days making huge projects that cover the entirety of the theme's capability and some people just win with way smaller projects. I always thought that it was weird but then I found the magic. So, the trick here is that, instead of finding a project that captures the whole theme, find what the judges are working on and what kind of projects were winners before and then copy-paste bits and parts of each of those findings into your project. So, let's say I am building a car and there are 2 judges at the science fair. 1 judge works with solar panels and 1 judge works with business model canvas. So, what I do is I make it a solar-powered car and make a business model and I search up previous winners and create a poster inspired by a winner's poster that is simple. Now, even if I make a fault in the model or in showing the calculations for the solar panel, they wouldn't be upset, instead, they would be eager to showcase their expertise. And the poster? Here's a fact, the human brain was designed to love simple things, especially familiar things. Don't believe me? Give it a try and thank me later.