Historical First-Person Adventure Design

I want to build an expansive open-world adventure set in a carefully researched historical era. The entire experience will be played from a first-person perspective, so every mechanic, environment and interaction must feel immediate and immersive... (Budget: ₹600 - ₹1500 INR, Jobs: 3D Modelling, Game Design, Game Development, Game Testing, Graphic Design, Level Design, Prop Painting and Weathering, Unity, Unity 3D, Unreal Engine)