Watch some videos about game engines to learn about the pros and cons of each. I personally did not find Unity as intuitive as most people seem to, and found Godot much faster to learn. Godot is also a lightweight engine so it'll run pretty well no matter what hardware you're working with. The downsides are, you have to be willing to learn how to code with GDScript and there are less tutorials than there are for Unity. (Especially because Godot just updated to version 4.5 this week, many tutorials will be at least a little outdated.) However, this will also encourage you to learn what you're doing instead of blindly following tutorials. And you have almost 2 weeks to practice :)
Unreal I found easier than Unity (again, that's not everyone's experience -- I encourage you to try a few engines and see what you like), but Unreal is a pretty heavy-duty game engine, you certainly don't need all it's fancy features for a game jam and if you're just working on a laptop or something it may struggle to load and run quickly/smoothly. I haven't personally tried Game Maker but if you're into platformers or RPGs there are additional engine options as well. Again, plenty of videos on YouTube comparing so you can get an idea of which you may want to try out.