"Most of the feedbacks I'm getting is about how I need more breadth and depth across every section, I really don't know what to do even that I always write the maximum words."
It is frustrating when you can't make the leap from feedback to improved marks but that is the only option open to you.
To be asked for more breadth AND depth sounds quite odd to me. However, it's worth unpicking it to try and create some practical things you can do.
Depth in academic speak usually refers to things like making sure all key terms are well defined, using supporting quotes from relevant sources. Illustrative examples to support the key points if your argument also add depth.
Breadth, I suppose, is making sure your overview of the subject is well mapped. That the key points are all addressed.
For distinction quality work, I would argue that depth is more important. Breadth will get you to a merit but depth on top of that will get you to a distinction.