It's just a suggestion and I dont mean anything bad. You can use github desktop to make a project with how many people you want.
But, how are we all supposed to modificate the Unity project all?
Thanks for the help, but there is also another problem, it’s difficult to collaborate together and organize the work in just one week
Thats true its hard to organize. But you could just push and pull using git of github. When making a repository of an existing unity project in github you can select preset for Unity in github desktop. It helps a lot.
