I found enough idea to start the project.
If you have any idea leave a comment

The Basics:

• Stamina system

• Hunger/Thirst system

• We can store the weapons only in a specific cabinet

• Campsite system

• There will not be that zombies there will also be Bandits / Mercenaries

• Perishable food

• Day / Night cycle

• Realistic scope

• And more………( ͡° ͜ʖ ͡°)