None of it blends. Which seems to be the main problem with your sigs, start by making your background black, then duplicating the render, and smudging it while playing with the shape dynamics and scattering of the smudging brush. Just to make sure the colours are blended. This also just looks like a bit of brushing, with a C4D placed on top with blend mode on colour dodge. In my opinion you need to look up some tutorials, and just follow them for some new techniques, working on your blending, your text, lighting, and flow.