I’m not going to give you many tips on improving this model but I will make a few suggestions on how to approach something like this.
Do you draw? Can you put down a few lines on a piece of paper that you will at least yourself understand? Well then, draw some quick conceptual ideas and fill them in with references. This could be anything from other mech bots and even a car engine or a machine at some factory. Anything. Then translate that into a 3D model. Remember that the rough sketch is not the final answer to your idea. It’s only a guide.
Aso; and this is very important for any mech design - look at the human form and translate that into machine. It sounds strange but when you look at (for instance) Japanese bot designs they are based on the familiarity of the human form and that is what really personalise them.
Your bot has got some nice thighs and upperleg ‘muscles’ but the feet are more duck or bird-like than human. The torso area is getting there but it needs more definition. A well build male usually has prominent pec areas - look at some anatomy books.
How does your joints move? How does your joint areas function? Take some time to figure this out. It will be worth it.
I like the overall idea and mdoel. It just needs some clarity and logic.