Okay, a cat would have been the last thing I would have thought of.
The most accurate shading here won't help to see it as a cat, because the proportions and all main features which make a cat looking like a cat aren't there.
Even in stylized art the basic proportions are there or at least succesfully altered or exaggerated that you still get the message, that's because the main features are clearly distinguishable and don't leave space for confusion.
I mean it rather looks like you are trying to improve your basics (form shading), than you want to draw "exactly that cat"
THe subject you chose and what you want to improve don't really lines up.
A real cat looks like that:
look at the shape of the ears, the shape of the tail and the size of the paws and maybe also the length of the body. That are the things which actually stand out and you got them all wrong in your drawing.
For example of a stylized version take a look at Garfield:
the shape of the ears, the mouth, the tail and the paws look like a cat. The proportions are utterly different from a real cats, but with the details it's enough that we immediately think of a cat and nothing else.
If you are rather looking for how to shades basic forms like spheres, cubes and cylinders since you don't know how it works you maybe should draw some isolated ones of them first and move on to more complex stuff once you understood how it works. Basic still life objects, like apples, bottles, human made tools and stuff with clear forms is better suited for that than living creatures.
Your "cat" also has the problem that it's exactly drawn in sideview, which flattens it even more and makes it harder than a bottle drawn in 3d space.
Every animal (as almost everything you will draw) is composed out of multiple forms. On top of that for any living object the concepts of gesture, weight, flow and anatomy have to be added in order to produce a successful drawing. Through simplifying, changing proportion you can end up with a more cartoon like character, which however will also strongly benefit from all the techniques mentioned above and in great simplified art you can still see that the artists know a lot more than the actually drew. THey just give you the information you need.
If you break down the cat into a really basic approach and low detail you also have there lots of interconnecting basic forms.
Best thing I could find with a quick search to show you that there are multiple forms - just look at all the spheres tubes and cylinders:
By breaking down problems in smaller problems you will find out and understand basic principles which will help you with every drawing in the long run.
While an apple will be not a lot more than a sphere and most fruits will have 1 or 2 forms, look how complex those bottles can get and reconsider how complex an animal actually is which don't has a fixed form shape, but also moving parts which can all be placed differently in space.