It’s really good to perform many smaller projects.
It gives you insight in conversion real life to model.
Big project will exists forever. And it takes a lot of time, while earning not that much.
Better improving yourself bit by bit.
I do like modeling, but a lot of time is also spend on composition, lighting, texturing, UV-mapping, Rigging, animation. The complexity in large projects is huge.
So, show us your progress. Or take part in a weekly challenge.
Or re-start The Blender Collab; Weekly Themed Gallery (Week 21)