I've done a few game jams, both on itch and in person, and my biggest tip is to make a title screen as soon as you can. It sort of forces you to think about the actual shape and flow of your game, and that both helps you keep your scope in check and makes the game feel more "real", at least in my experience.
I swear the timeframe is plenty! Remember you're not making Grand Theft Auto 6, you're just making something small and silly to practice all the nuts and bolts of gamedev. There are jams that are only a weekend long, or even a single day long, and some truly magical things come out of them. Take breaks - you're more productive when you're energized and excited than when you're just grinding out the motions. And don't forget to have fun! That's why we're here. :) I'm excited to see what you make!