i think there may be an over reliance on specific materials when it comes to this, i have noticed something similar in some of your other work but while somewhat noticeable in still shots like your renders i feel this is a much more pressing issue when it comes to animation as in my opinion it makes the environments and characters look very similar from one and other, i think your compositing and post processing help to mitigate this issue by injecting some variation but i feel your work could benefit from skills such as texture painting or a deeper understanding of procedurals and the nodes or tools that make them as well of some knowledge on pbr image texture workflow.
there are some great resources on youtube you could watch but if theres a course i would recommend is this 74 part series by sam bowman
https://www.youtube.com/watch?v=Uvc2P911rZk&list=PLEPLtrfjLBXjNObTIyYO8PEVtHtXFwsF9
or alternatively if you need a quick intro the course by default cube
https://www.youtube.com/watch?v=O3gLBhC353Y