3D Games dominate the games market. But 3D games are much harder to make!
Godot's 3D capabilities have got a lot better and maybe it's time you took a look.
Take some time to try out the tutorials here to see if your next game might be a 3d game.
Please note, this is for people with Godot 3d experience. Your first game should NOT be a 3d Game!!
You have six weeks to do some learning.
Pick a role and investigate some of the tools and techniques that you might want to use in your next game. Go with your strengths and interests. For more information on what each role needs to do see THIS DOCUMENT
As a team, divide and conquer. Choose a specialisation and dive deep. You could choose to remake (clone!) an existing game just so you can learn the cool new stuff that you'll need to know for making 3d games.
Remember this is the time to take risks and expand your knowledge. It doesn't matter if it goes wrong; you'll have learned a lot along the way. There is no assessment so it's up to you to make use of this time and upskill.
Good luck
Industry standard (but hard to learn)
Simpler Low Poly modelling Tool
Like drawing sprites, but in 3d!
Imphenzia has a great LowPoly technique worth checking out.
Godot has a pretty useful Asset Library where you can find a bunch of templates and tools for everythong that you need. In fact the Terrain 3D and the Cyclops editor above are all from there.
As a game developer, you'll want to get starter assets so that you can get up and running quickly and not have to create ANOTHER first person controller etc. So if you want to use then, SRCoder has made a few to get you started experimenting with 3D Games. Use them if you want or find others, the choice is yours.