in the unity asset store there is a unity made asset called game kit 3D
(https://assetstore.unity.com/packages/essentials/tutorial-projects/3d-game-kit-115747)
this is an amazing kit we can collaborate together (15-30 people) and start making a real awesome game
the kit has everything from scripts to assets we only need to build and design the world
whats the plan?
the idea is that each person will make a level (long & polished about 1 hour of gameplay)
a few people will work on the the story
after a short time we could have a pretty decent game that we can sell on steam for a low price (10-15$)
each developer will receive a small percentage of the earnings
if someone would want to join this cool project you can email me at: shukron90@gmail.com
if you will have enough developer (more then 10) we will start working on it 