Take it easy, and try to make sure you finish something. Learning to make a project in the scope of a game jam timeline is a skill.
If you haven't made a game before, or haven't used Godot before, I would start doing tutorials now before the jam starts. Learn how to make a platformer now, and when the jam starts, make a new project thats on theme and you won't have to learn how to do something for the first time ever during the jam